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Journal Article

ACICULAR ZONED TOURMALINE (MAGNESIO-FOITITE TO FOITITE) FROM A QUARTZ VEIN NEAR TISOVEC, SLOVAKIA: THE RELATIONSHIP BETWEEN CRYSTAL CHEMISTRY AND ACICULAR HABIT Available to Purchase

Peter Bačík, Andreas Ertl, Martin Števko, Gerald Giester, Peter Sečkár
Published: 19 September 2015
The Canadian Mineralogist (2015) 53 (2): 221–234.
DOI: https://doi.org/10.3749/canmin.1400085
...Peter Bačík; Andreas Ertl; Martin Števko; Gerald Giester; Peter Sečkár Abstract Distinctly chemically zoned tourmaline was found in a quartz vein near Tisovec, Slovak Ore Mountains, Slovakia. The tourmaline forms radial aggregates of light grey to green thin prismatic to acicular crystals growing...
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View PDF for article title, <span class="search-highlight">ACICULAR</span> ZONED TOURMALINE (MAGNESIO-FOITITE TO FOITITE) FROM A QUARTZ VEIN NEAR TISOVEC, SLOVAKIA: THE RELATIONSHIP BETWEEN CRYSTAL CHEMISTRY AND <span class="search-highlight">ACICULAR</span> HABIT
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Journal Article

Biotic-Abiotic Radial-Acicular Crystal Fan Fabrics with Rosickýite at the Angel Springs Tufa-Travertine Deposit in Southern British Columbia Available to Purchase

Paul L. Broughton
Published: 28 December 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (6): 1063–1094.
DOI: https://doi.org/10.3749/2300015
... coalesced and were partially recrystallized, resulting in spheroidal crystalline fabrics that preserve inclusion-delineated concentric growth surfaces. Syntaxial overgrowths of radially aligned acicular crystals rapidly expanded from these core areas of coalesced calcite, resulting in the formation...
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View PDF for article title, Biotic-Abiotic Radial-<span class="search-highlight">Acicular</span> Crystal Fan Fabrics with Rosickýite at the Angel Springs Tufa-Travertine Deposit in Southern British Columbia
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Journal Article

Origin of reverse zoning in branching orthopyroxene and acicular plagioclase in orbicular diorite, Fisher Lake, California Available to Purchase

D. G. Durant, A. D. Fowler
Published: 01 December 2002
Mineralogical Magazine (2002) 66 (6): 1003–1019.
DOI: https://doi.org/10.1180/0026461026660073
...D. G. Durant; A. D. Fowler Abstract An orbicular diorite from Fisher Lake, California, USA, contains multi-shelled, magmatic orbicules with branching and budding orthopyroxene crystals as well as feather and acicular plagioclase crystals that are oriented perpendicular to the growth horizon...
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View PDF for article title, Origin of reverse zoning in branching orthopyroxene and <span class="search-highlight">acicular</span> plagioclase in orbicular diorite, Fisher Lake, California
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Journal Article

ACICULAR SPHALERITE ENRICHED IN Ag, Sb, AND Cu EMBEDDED WITHIN COLOR-BANDED SPHALERITE FROM THE KOKANEE RANGE, BRITISH COLUMBIA, CANADA Available to Purchase

Georges Beaudoin
Published: 01 December 2000
The Canadian Mineralogist (2000) 38 (6): 1387–1398.
DOI: https://doi.org/10.2113/gscanmin.38.6.1387
... layers commonly contains acicular crystals of sphalerite oriented perpendicular to the layer boundary. Acicular sphalerite is enriched in Sb, Ag and Cu, which substitute for Zn in the structure. The base of the layers is commonly marked by chains of complex inclusions of chalcopyrite, galena, pyrargyrite...
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View PDF for article title, <span class="search-highlight">ACICULAR</span> SPHALERITE ENRICHED IN Ag, Sb, AND Cu EMBEDDED WITHIN COLOR-BANDED SPHALERITE FROM THE KOKANEE RANGE, BRITISH COLUMBIA, CANADA
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Journal Article

Oriented overgrowth of acicular maghemite crystals on quartz Free

M. M. Abreu, M. O. Figueiredo, J. C. Waerenborgh, J. M. P. Cabral
Journal: Clay Minerals
Published: 01 December 1988
Clay Minerals (1988) 23 (4): 357–365.
Add to Citation Manager for Oriented overgrowth of <span class="search-highlight">acicular</span> maghemite crystals on quartz
Journal Article

Calcite pseudospar replacive of marine acicular aragonite, and implications for aragonite cement diagenesis Available to Purchase

S. J. Mazzullo
Published: 01 June 1980
Journal of Sedimentary Research (1980) 50 (2): 409–422.
DOI: https://doi.org/10.1306/212F7A18-2B24-11D7-8648000102C1865D
...S. J. Mazzullo Abstract Botryoidal and fan-shaped masses of polycrystalline calcite pseudospar from Permian biohermal limestones in New Mexico and Texas are interpreted as replacements of radially-divergent, acicular marine cements. The mosaic consists of composites of and individual ray-crystals...
View PDF for article title, Calcite pseudospar replacive of marine <span class="search-highlight">acicular</span> aragonite, and implications for aragonite cement diagenesis
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Journal Article

Fascicular-optic calcite; a replacement of bundled acicular carbonate cements Available to Purchase

A. C. Kendall
Published: 01 September 1977
Journal of Sedimentary Research (1977) 47 (3): 1056–1062.
DOI: https://doi.org/10.1306/212F72D9-2B24-11D7-8648000102C1865D
...A. C. Kendall Abstract A previously unreported, coarsely crystalline calcite fills pores and is composed of crystals that possess inclusion-patterns and lattice-curvatures mimetic after bundled acicular carbonate cements. This calcite fabric, named 'fascicular-optic' because of the characteristic...
View PDF for article title, Fascicular-optic calcite; a replacement of bundled <span class="search-highlight">acicular</span> carbonate cements
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Proton binding on (a) crystallographic faces of acicular akaganéite (β-FeOOH) nanoparticles through modeled by concomitant (a,b) face-specific adsorption of potential-determining ions (H+, OH−) on dominant crystallographic faces (‘surface complexation’) and (b) H+ and Cl− diffusion (‘ion exchange’) through tips of acicular particles, here taken as the (010) of face. (c) A composite SCM-Donnan diffusion model explaining the pH and ionic strength-dependent surface change and bulk ion exchange. Redrawn from Kozin and Boily (2013b).

Proton binding on (a) crystallographic faces of acicular akaganéite (β-Fe... Available to Purchase

Published: 28 March 2025
Figure 14. Proton binding on (a) crystallographic faces of acicular akaganéite (β-FeOOH) nanoparticles through modeled by concomitant (a,b) face-specific adsorption of potential-determining ions (H + , OH − ) on dominant crystallographic faces (‘surface complexation’) and (b) H + and Cl
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(a) Crust formed by acicular paulišite crystals (Plš) with a thin hydrozincite (Hznc) layer and light blue hydrozincite at the contact with rock (holotype sample); (b) acicular crystals of paulišite with Zn-containing aragonite (Arg) aggregates and hemispherical aggregates of hydrozincite, BSE photo (holotype sample); (c) paulišite crust with thin layers of fine-grained Zn-bearing aragonite and intergrowths of hydrozincite and aragonite at the contact with rock; (d) elongated crystals of paulišite in association with calcite (Cal), aragonite and hydrozincite in monohydrocalcite (Mhcal) matrix, BSE photo.

( a ) Crust formed by acicular paulišite crystals (Plš) with a thin hydrozi... Available to Purchase

Published: 01 March 2025
Figure 1. ( a ) Crust formed by acicular paulišite crystals (Plš) with a thin hydrozincite (Hznc) layer and light blue hydrozincite at the contact with rock (holotype sample); ( b ) acicular crystals of paulišite with Zn-containing aragonite (Arg) aggregates and hemispherical aggregates
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(A) Hand specimen of acicular hornblende gabbro at Laiyuan complex, eastern China, containing small &lt;1-cm-wide aplite veins. (B) Representative miarolitic cavity within acicular hornblende gabbro consistent with euhedral quartz, garnet, plagioclase, and zoned amphiboles. (C) Hand specimen of amphibole-rich pegmatite, showing high proportion of (D) leucocratic minerals (e.g., K-feldspar, plagioclase, and quartz) and (E, F) anhedral brown amphibole cores rimmed or partially replaced by chloride and surrounded by euhedral green amphiboles. apa—apatite; b-amph—brown amphibole; chl—chloride; g-amph—green amphibole; grt—garnet; kfs—K-feldspar; plag—plagioclase; qtz—quartz. Note that panel F is a backscattered electron image.

(A) Hand specimen of acicular hornblende gabbro at Laiyuan complex, eastern... Available to Purchase

Published: 22 January 2025
Figure 4. (A) Hand specimen of acicular hornblende gabbro at Laiyuan complex, eastern China, containing small <1-cm-wide aplite veins. (B) Representative miarolitic cavity within acicular hornblende gabbro consistent with euhedral quartz, garnet, plagioclase, and zoned amphiboles. (C) Hand
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(a) Pseudo-acicular mineral precipitate coating filamentous cells observed using SE-SEM. (b) Elemental composition identified using EDS indicates that the phase in (a) is likely schwertmannite. (c) Example of schwertmannite precipitate maintaining the morphology of a filamentous cell, on which a second mineral phase is forming. (d) Rosettes of tabular crystals. (e) Elemental composition consistent with ammoniojarosite identified for the phase in (d). (f–h) Additional precipitates of pseudo-cubic euhedral crystals forming from or within the schwertmannite. Box in (f) indicates region shown in (g); box in (g) indicates region shown in (h). Note, the identified gold is an artefact of the gold coating.

(a) Pseudo-acicular mineral precipitate coating filamentous cells observed ... Available to Purchase

Published: 16 July 2024
Fig. 3. (a) Pseudo-acicular mineral precipitate coating filamentous cells observed using SE-SEM. (b) Elemental composition identified using EDS indicates that the phase in (a) is likely schwertmannite. (c) Example of schwertmannite precipitate maintaining the morphology of a filamentous cell
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Representative amphibole-rich cumulate xenoliths at Tongling, eastern China. (A) Primitive cumulate xenolith with typical adcumulate texture. (B) Cumulate piles entrained by gabbro, noting an ambiguous contact, denoting a semi-consolidated state where they are entrained. (C) Acicular hornblende gabbro, highlighted by heterogeneous texture and elongated to acicular hornblende. (D) Reaction-replacement amphibole-rich cumulate with anhedral clinopyroxene poikilitically replaced amphibole/phlogopite oikocryst. (E) Photomicrograph of acicular hornblende gabbro. apa—apatite; b-amph—brown amphibole; bio—biotite; cpx—clinopyroxene; phl—phlogopite; plag—plagioclase.

Representative amphibole-rich cumulate xenoliths at Tongling, eastern China... Available to Purchase

Published: 22 January 2025
Figure 6. Representative amphibole-rich cumulate xenoliths at Tongling, eastern China. (A) Primitive cumulate xenolith with typical adcumulate texture. (B) Cumulate piles entrained by gabbro, noting an ambiguous contact, denoting a semi-consolidated state where they are entrained. (C) Acicular
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Acicular-prismatic arsenopyrite. Suzdal’ deposit: A, stellar aggregate of acicular arsenopyrite; B, growth of acicular and prismatic arsenopyrite (1) over globular-crystalline pyrite (2); C, acicular and stellar arsenopyrite (polished microsection); Bol’shevik deposit: D, drusoid aggregate of prismatic arsenopyrite.

Acicular-prismatic arsenopyrite. Suzdal’ deposit: A , stellar aggregate of... Available to Purchase

Published: 01 February 2011
Fig. 5. Acicular-prismatic arsenopyrite. Suzdal’ deposit: A , stellar aggregate of acicular arsenopyrite; B , growth of acicular and prismatic arsenopyrite (1) over globular-crystalline pyrite (2); C , acicular and stellar arsenopyrite (polished microsection); Bol’shevik deposit: D , drusoid
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Upper interval travertine fabrics characterized by stacked radial-acicular crystal fans across pool bottom depositional surfaces. Rapid degassing resulted in the biotic–abiotic transition with calcite precipitation lengthening the radial fabric. (A, B) Each crystal fan consists of 0.5–3 mm-long radial-acicular crystals. The coalesced central core areas of the crystal fans are often partially recrystallized. The inclusion-delineated curvilinear growth surfaces do not interrupt the optical continuity of each fan.

Upper interval travertine fabrics characterized by stacked radial-acicular ... Available to Purchase

Published: 28 December 2023
Fig. 13. Upper interval travertine fabrics characterized by stacked radial-acicular crystal fans across pool bottom depositional surfaces. Rapid degassing resulted in the biotic–abiotic transition with calcite precipitation lengthening the radial fabric. (A, B) Each crystal fan consists of 0.5–3
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Acicular and needle crystal components of radial crystal fan structures developed in response to rapid degassing. Progressive coalescence of the fan central core areas preserved inclusion-delineated concentric growth surfaces, but partial recrystallization resulted in patchy zones of spar, obliterating inclusion evidence of the concentric growth surfaces.

Acicular and needle crystal components of radial crystal fan structures dev... Available to Purchase

Published: 28 December 2023
Fig. 19. Acicular and needle crystal components of radial crystal fan structures developed in response to rapid degassing. Progressive coalescence of the fan central core areas preserved inclusion-delineated concentric growth surfaces, but partial recrystallization resulted in patchy zones
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Microphotographs of uranyl arsenates–phosphates. (a) Yellow acicular crystals of arsenuranospathite–chistyakovaite. (b) Well-formed tabular crystal of (meta)nováčekite in a fine-grained rusty mass. Photo Š. Ferenc.

Microphotographs of uranyl arsenates–phosphates. (a) Yellow acicular crysta... Available to Purchase

Published: 04 October 2023
Figure 4. Microphotographs of uranyl arsenates–phosphates. (a) Yellow acicular crystals of arsenuranospathite–chistyakovaite. (b) Well-formed tabular crystal of (meta)nováčekite in a fine-grained rusty mass. Photo Š. Ferenc.
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(a) Multiple, superimposed laminae of banded travertine mainly formed by a dense palisade of acicular, needle-like crystals with pointed termination. (b) Example of ray-shaped fans of acicular crystals. (c) Micron-size, black alteration at the top of a lamina. The successive growth of a new crystal palisade from the alteration nucleus should be noted. (d) Alternation of acicular and blocky crystal laminae limited by levels of alteration. The ‘ghost’ acicular morphologies inside the blocky crystals should be noted. (e) CL image of same alternation of laminae as in (d). The banding testifies to different origins of the waters. It should be noted that blocky and acicular crystals have the same colours. (f) Banded laminae with acicular and blocky morphologies and alteration levels. (g) CL image of area shown in (f). Arrowheads indicate the continuity between the alteration level and rims of blocky crystals.

( a ) Multiple, superimposed laminae of banded travertine mainly formed by ... Available to Purchase

Published: 30 January 2014
Fig. 8. ( a ) Multiple, superimposed laminae of banded travertine mainly formed by a dense palisade of acicular, needle-like crystals with pointed termination. ( b ) Example of ray-shaped fans of acicular crystals. ( c ) Micron-size, black alteration at the top of a lamina. The successive growth
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(a–d) BSE images of acicular silicate micro-inclusions in chromite grains from the Purang chromitites. (d) Plane-polarized light photomicrographs of acicular (Cpx) inclusions in chromite grains from the high-Al chromitites. (Color online.)

( a–d ) BSE images of acicular silicate micro-inclusions in chromite grains... Available to Purchase

Published: 01 June 2023
Figure 4. ( a–d ) BSE images of acicular silicate micro-inclusions in chromite grains from the Purang chromitites. ( d ) Plane-polarized light photomicrographs of acicular (Cpx) inclusions in chromite grains from the high-Al chromitites. (Color online.)
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(a) FIB foil of the acicular inclusion shown in Figure 7a with a vertical feature near the center of the foil. (b) TEM image of an acicular clinopyroxene inclusion surrounded by open spaces in a chromite grain. (c) EDX spectrum of the same inclusion showing peaks of Fe, Si, and O as well as Mg, Al, and Cr. The black domains may have been filled with fluids. (d and e) X-ray elemental maps along the orange line across the inclusion, showing major Fe, Si, and O peaks. The Cr, Al, and Mg are concentrated in the host chrome spinel. (Color online.)

( a ) FIB foil of the acicular inclusion shown in Figure 7a with a vertic... Available to Purchase

Published: 01 June 2023
Figure 9. ( a ) FIB foil of the acicular inclusion shown in Figure 7a with a vertical feature near the center of the foil. ( b ) TEM image of an acicular clinopyroxene inclusion surrounded by open spaces in a chromite grain. ( c ) EDX spectrum of the same inclusion showing peaks of Fe, Si
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High-magnification photographs of SHM in plane-polarized light, showing the character of the grain boundaries: (a) transition of the central prismatic crystal to numerous acicular crystals; (b) transition of the core region from a single crystal to numerous acicular crystals; (c) the divergence of acicular crystals from the central prismatic crystal visible at the extreme left of the photograph; (d) interpenetration of acicular crystals of different orientation.

High-magnification photographs of SHM in plane-polarized light, showing the... Available to Purchase

Published: 01 October 2008
F ig . 3. High-magnification photographs of SHM in plane-polarized light, showing the character of the grain boundaries: ( a ) transition of the central prismatic crystal to numerous acicular crystals; ( b ) transition of the core region from a single crystal to numerous acicular crystals; ( c