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omphacitite

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Journal Article

Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah

Daniel J. Schulze, Roberta L. Flemming, Patrick H.M. Shepherd, Herwart Helmstaedt
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1277–1283.
DOI: https://doi.org/10.2138/am.2014.4771
...Daniel J. Schulze; Roberta L. Flemming; Patrick H.M. Shepherd; Herwart Helmstaedt Abstract Guyanaite, naturally occurring β-CrOOH, has been identified in a xenolith of Cr-rich omphacitite from the Moses Rock diatreme in the Navajo Volcanic Field of the southwestern United States. It occurs...
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Omphacite-diopside vein in an omphacitite block from the Osayama serpentinite melange, Sangun-Renge metamorphic belt, southwestern Japan

Tatsuki Tsujimori
Published: 01 December 1997
Mineralogical Magazine (1997) 61 (6): 845–852.
...Tatsuki Tsujimori Abstract Omphacite (Jd (sub 46.1-52.0) Ae (sub 0-8.4) Aug (sub 48.0-51.2) ) and diopside (Jd (sub 4.3-6.3) Ae (sub 0-0.4) Aug (sub 93.6-95.6) ) coexist in a vein cutting an omphacitite block in a serpentinite melange of the Oeyama ophiolite, central Chugoku Mountains...
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Origin of omphacitites from the Nishisonogi metamorphic rocks, western Kyushu, Japan: comparison with jadeitites

Miki Shigeno, Yasushi Mori, Kazuhiko Shimada, Tadao Nishiyama
Published: 01 March 2012
European Journal of Mineralogy (2012) 24 (2): 247–262.
DOI: https://doi.org/10.1127/0935-1221/2012/0024-2198
...Miki Shigeno; Yasushi Mori; Kazuhiko Shimada; Tadao Nishiyama Abstract Two types of omphacitites are distinguished in ultramafic mélanges that are intercalated with epidote–blueschist facies schists of the Nishisonogi metamorphic rocks in western Kyushu, Japan. One is an omphacitite layer...
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Mode of occurrence of omphacitites in the Nishisonogi metamorphic rocks (up...

Published: 01 March 2012
Fig. 2 Mode of occurrence of omphacitites in the Nishisonogi metamorphic rocks (upper) and cross-sections of the investigated samples (lower). (a) Omphacitite layer in a metabasite block from Nishikashiyama. (b) Omphacitite lens in an albitite block from Mie. Abbreviations: OM, omphacitite; AM
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Varieties of jadeitites from the Taw Maw and Hpakant regions. ( a ) Jadeiti...

Published: 21 July 2023
Fig. 5. Varieties of jadeitites from the Taw Maw and Hpakant regions. ( a ) Jadeitite showing metasomatic texture with a stringer of black omphacitite. ( b ) Heterogeneous jadeitite with green kosmochlore, white albitite and stringer of black omphacitite. ( c ) Boulders of jadeitite showing
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(a–c) Photomicrographs of the Nishikashiyama sample; (a) omphacitite, (b) a...

Published: 01 March 2012
Fig. 3 (a–c) Photomicrographs of the Nishikashiyama sample; (a) omphacitite, (b) amphibole-rich selvage, (c) metabasite. (d–h) Photomicrographs from the Mie sample; (d) omphacitite, (e) inner amphibole-rich selvage, (f) boundary between omphacitite and amphibole-rich selvage, (g) outer amphibole
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(a) Hand specimen of CCR (chromian omphacitite, sample C) with disseminated...

Published: 01 March 2010
Fig. 3. (a) Hand specimen of CCR (chromian omphacitite, sample C) with disseminated MPPs (multi-phase pseudomorphs). (b) Most of the disseminated multi-phase pseudomorphs within the chromian clinopyroxene rock have hexagonal outlines (scanning image on thin section in transmitted light).
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Omphacitite phacoid (outlined) embedded in chlorite-actinolite schist matri...

Published: 01 August 2003
F ig . 3. Omphacitite phacoid (outlined) embedded in chlorite-actinolite schist matrix, Rocky Beach Metamorphic Melange, Rocky Beach (GR 92812147). Diameter of phacoid is ~1.4 m.
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Whole-rock trace element patterns of omphacitites and jadeitites normalised...

Published: 01 March 2012
Fig. 7 Whole-rock trace element patterns of omphacitites and jadeitites normalised to N-MORB ( Sun & McDonough, 1989 ). Elements are organised from left to right in order of increasing ion radius. (a) Nishikashiyama and Mie omphacitites and their host rocks. Syros omphacitites from Greece
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Omphacite compositions from Mie and Nishikashiyama omphacitites plotted in ...

Published: 01 March 2012
Fig. 4 Omphacite compositions from Mie and Nishikashiyama omphacitites plotted in the classification diagram of Morimoto et al . (1988) . The shaded areas indicate compositional trends of sodic pyroxenes from the Nishisonogi metamorphic rocks: sodic pyroxenes with aegirine-augite cores
Journal Article

Petrographic classification of unusual high-pressure metamorphic rocks

Roberto Giustetto, Roberto Compagnoni
Published: 01 October 2014
European Journal of Mineralogy (2014) 26 (5): 635–642.
DOI: https://doi.org/10.1127/0935-1221/2014/0026-2395
... by fluids precipitating an omphacite-rich pyroxene ( García-Casco et al. , 2009 ; Cárdenas-Párraga et al. , 2012 ), but in different jadeitite samples from the Rio San Juan complex of the Dominican Republic serpentinite mélange “trends from jadeitite to omphacitite, from omphacitite to jadeitite...
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(a) A cluster of euhedral jadeite crystals (Jd-II) formed on fine-grained j...

Published: 01 March 2012
~15 cm). (c) Omphacitite boulder (sample Rma, width ~10 cm). (d) Kosmochlor rock and jadeitite (width ~16 cm). (e) Crushed jadeitite fragments filled by amphibole matrix (width ~20 cm each). (f) Later stage albitite vein cutting through jadeitite, omphacitite, amphibole rock and/or kosmochlor rock
Journal Article

Neolithic polished greenstone industry from Castello di Annone (Italy): minero-petrographic study and archaeometric implications

Roberto Giustetto, Ursula Perrone, Roberto Compagnoni
Published: 01 December 2016
European Journal of Mineralogy (2016) 28 (5): 889–905.
DOI: https://doi.org/10.1127/ejm/2016/0028-2558
... in the Pellice Valley discovered small boudins of fine-grained eclogites and omphacitites, similar to those found in the prehistoric tools. The Castello di Annone eclogites, which appear to be poorly fashioned from fluvial pebbles, must be considered low quality materials. This confirms the marginal role...
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Blueschist and eclogite in tectonic melange, Port Macquarie, New South Wales, Australia

D. J. Och, E. C. Leitch, G. Caprarelli, T. Watanabe
Published: 01 August 2003
Mineralogical Magazine (2003) 67 (4): 609–624.
DOI: https://doi.org/10.1180/0026461036740121
...F ig . 3. Omphacitite phacoid (outlined) embedded in chlorite-actinolite schist matrix, Rocky Beach Metamorphic Melange, Rocky Beach (GR 92812147). Diameter of phacoid is ~1.4 m. ...
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BSE images of (a) replacement of omphacite by jadeite, new jadeite filling ...

Published: 01 March 2012
Fig. 4 BSE images of (a) replacement of omphacite by jadeite, new jadeite filling fractures, with zircon and titanite (Sample YX-1). (b) Titanite with residual ilmenite core in omphacite-bearing jadeitite and omphacitite (YX-1). (c) Photomicrograph of kosmochlor aggregates with a corona texture
Journal Article

High-pressure meta-ophiolite boulders and cobbles from northern Italy as possible raw-material sources for “ greenstone ” prehistoric tools: petrography and archaeological assessment

Benjámin Váczi, György Szakmány, Elisabetta Starnini, Zsolt Kasztovszky, Zsolt Bendő, Flavio A. Nebiacolombo, Roberto Giustetto, Roberto Compagnoni
Published: 01 September 2019
European Journal of Mineralogy (2019) 31 (5-6): 905–917.
DOI: https://doi.org/10.1127/ejm/2019/0031-2859
...) the Monviso Massif area (as primary source), (ii) the Po River, and (iii) the Curone stream (as secondary sources). The search for “Na-pyroxene rocks” ( i.e. , jadeitite, omphacitite and mixed Na-pyroxenite) and “Na-pyroxene + garnet rocks” (eclogite and garnet-omphacitite) was in the crosshair, since...
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Compositional variation of Na-pyroxenes from a mixed Na-pyroxenite, an omph...

Published: 01 December 2016
Fig. 9 Compositional variation of Na-pyroxenes from a mixed Na-pyroxenite, an omphacitite [PIEM 52: compositional variation between A) bluish- and B) colourless pyroxenes] and three jadeitites, plotted in the ternary diagram of Morimoto et al . (1988) . Black dots represent the average Na
Journal Article

Mineralogy of jadeitite and related rocks from Myanmar: a review with new data

Guanghai Shi, George E. Harlow, Jing Wang, Jun Wang, Enoch Ng, Xia Wang, Shumin Cao, Wenyuan Cui
Published: 01 March 2012
European Journal of Mineralogy (2012) 24 (2): 345–370.
DOI: https://doi.org/10.1127/0935-1221/2012/0024-2190
... ~15 cm). (c) Omphacitite boulder (sample Rma, width ~10 cm). (d) Kosmochlor rock and jadeitite (width ~16 cm). (e) Crushed jadeitite fragments filled by amphibole matrix (width ~20 cm each). (f) Later stage albitite vein cutting through jadeitite, omphacitite, amphibole rock and/or kosmochlor rock...
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New occurrences of jadeitite, jadeite quartzite and jadeite-lawsonite quartzite in the Dominican Republic, Hispaniola: petrological and geochronological overview

Hans-Peter Schertl, Walter V. Maresch, Klaus P. Stanek, Andreas Hertwig, Martin Krebs, Rauno Baese, Sergey S. Sergeev
Published: 01 March 2012
European Journal of Mineralogy (2012) 24 (2): 199–216.
DOI: https://doi.org/10.1127/0935-1221/2012/0024-2201
... into jadeitite quartzite (JQ), jadeite-lawsonite quartzite (JLQ) and jadeite-free lawsonite quartzite (LQ). The second suite is found both as blocks and boulders as well as layers and veins in blueschist blocks. One single occurrence of a cross-cutting omphacitite vein in blueschist has also been observed...
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Ba minerals in clinopyroxene rocks from the Myanmar jadeitite area: implications for Ba recycling in subduction zones

Guanghai Shi, Neng Jiang, Yuwang Wang, Xin Zhao, Xia Wang, Guowu Li, Enoch Ng, Wenyuan Cui
Published: 01 March 2010
European Journal of Mineralogy (2010) 22 (2): 199–214.
DOI: https://doi.org/10.1127/0935-1221/2010/0022-1998
...Fig. 3. (a) Hand specimen of CCR (chromian omphacitite, sample C) with disseminated MPPs (multi-phase pseudomorphs). (b) Most of the disseminated multi-phase pseudomorphs within the chromian clinopyroxene rock have hexagonal outlines (scanning image on thin section in transmitted light). ...
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