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hilgardite

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Journal Article
Published: 01 April 2014
Mineralogical Magazine (2014) 78 (2): 235–252.
...J. D. Grice; R. Rowe Abstract Hilgardite, Ca 2 B 5 O 9 Cl·H 2 O, has a zeolite-type framework structure consisting of cross-linked (010) layers of borate sheets having the fundamental building block (FBB) = 2Δ3□:<Δ2□>-<Δ2□>. These layers are polar and the orientation, plus the number...
FIGURES | View All (12)
Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1206–1212.
... of leucostaurite ( R 1 = 6.2%) contains a hilgardite-type three-dimensional [B 5 O 9 ] 3− framework. Leucostaurite is the first mineral of the hilgardite group with orthorhombic ( Pnn 2) symmetry. However, several borates synthesized for their non-linear optical properties are structurally and chemically closely...
FIGURES
Journal Article
Published: 01 February 2001
The Canadian Mineralogist (2001) 39 (1): 129–135.
... hydrothermale. La structure est étroitement reliée à celle des minéraux zéolitiques de type hilgardite, Ca 2 B 5 O 9 Cl·H 2 O, en particulier celle de l’hilgardite-1 A , triclinique. Les principales différences structurales proviennent d’une conformation plus symétrique des chaînes pentaborates [B 5 O...
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Journal Article
Published: 01 December 1986
The Canadian Mineralogist (1986) 24 (4): 689–693.
Journal Article
Published: 01 June 1985
American Mineralogist (1985) 70 (5-6): 636–637.
...Subrata Ghose Abstract The crystal structures of various monoclinic and triclinic mineral phases belonging to the hilgardite, Ca 2 B 5 O 9 Cl · H 2 O–tyretskite, Ca 2 B 5 O 9 OH · H 2 O group are based on the linkage in chains or layers of pentaborate polyanions, [B 5 O 12 ] 9− , which can exist...
Journal Article
Published: 01 December 1982
American Mineralogist (1982) 67 (11-12): 1265–1272.
...Subrata Ghose Abstract The minerals of the hilgardite group with the chemical composition Ca 2 [B 5 O 9 ]·H 2 O occur in a number of triclinic and monoclinic phases. In addition, an orthorhombic anhydrous phase has been synthesized. The building block of all of these structures is the pentaborate...
Journal Article
Published: 01 April 1980
American Mineralogist (1980) 65 (3-4): 346–348.
...M. J. Peltre; B. Berglund; D. G. Carson; R. W. Vaughan Abstract A proton magnetic resonance study, at room temperature, of a single crystal of hilgardite, Ca 2 [B 5 O 9 ]Cl · H 2 O, has been carried out at 270 MHz. The variations of the dipolar splittings in the NMR spectra have been studied...
Journal Article
Published: 01 February 1979
American Mineralogist (1979) 64 (1-2): 187–195.
...S. Ghose; C. Wan Abstract Hilgardite, Ca 2 B 5 O 9 Cl · H 2 0, from Choctow Salt Dome, Iberville Parish, Louisiana, is monoclinic, space group Aa, with unit-cell dimensions a = 11.438(2), b = 11.318(2), c = 6.318(1)A, β = 90.06(1)°, and Z = 4. The crystal structure has been determined from...
Journal Article
Published: 01 December 1938
American Mineralogist (1938) 23 (12): 898–902.
...Cornelius S. Hurlbut, Jr.; Ralph E. Taylor Abstract A general discussion of the water-insoluble residues from the rock salt of Louisiana salt plugs has been given by Taylor (1937). A new mineral, hilgardite, described by Hurlbut and Taylor (1937), and an associated mineral, parahilgardite...
Journal Article
Published: 01 October 1937
American Mineralogist (1937) 22 (10): 1052–1057.
...Cornelius S. Hurlbut, Jr.; Ralph E. Taylor Abstract In the insoluble residue from a brine well in the Choctaw Salt Dome, Louisiana, is found an unusual mineral assemblage. Hilgardite, a new species, is found there in association with anhydrite, danburite, boracite, and other minerals. Hilgardite...
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SEM images of <span class="search-highlight">hilgardite</span> from the Penobsquis deposit: ( a ) cluster of hilg...
Published: 01 April 2014
F ig . 3. SEM images of hilgardite from the Penobsquis deposit: ( a ) cluster of hilgardite-1 A (F97-29), ( b ) crystal group of hilgardite-3 A (F97-26) and ( c ) kurgantaite (F97-57).
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Comparison of calculated <span class="search-highlight">hilgardite</span>-4 M  XRPD pattern with <span class="search-highlight">hilgardite</span> group...
Published: 01 April 2014
F ig . 5. Comparison of calculated hilgardite-4 M XRPD pattern with hilgardite group minerals found in Sussex, New Brunswick.
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μXRPD identification of a <span class="search-highlight">hilgardite</span>-3 A  and -1 A  mixture by profile fitt...
Published: 01 April 2014
F ig . 6. μXRPD identification of a hilgardite-3 A and -1 A mixture by profile fitting of calculated XRPD patterns. Caption: 1 to 7 are diagnostic features that confirm a hilgardite-3 A and -1 A mixture.
Journal Article
Published: 01 October 2005
The Canadian Mineralogist (2005) 43 (5): 1469–1487.
... dans la séquence évaporitique. Les espèces minérales identifiées dans les carottes incluent: boracite, brianroulstonite, chambersite, colemanite, congolite, danburite, hilgardite, howlite, hydroboracite, kurgantaïte, penobsquisite, pringleïte, ruitenbergite, strontioginorite, szaibélyite...
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Journal Article
Published: 01 November 1938
American Mineralogist (1938) 23 (11): 765–771.
...Cornelius S. Hurlbut, Jr. Abstract The new species, parahilgardite, found in the Choctaw Salt Dome, Louisiana, is so named because of its close similarity with hilgardite. The specimens are invariably made up of one right-hand and one left-hand individual attached to the negative end of the a-axis...
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UNIT-CELL DATA OF <span class="search-highlight">HILGARDITE</span>-RELATED COMPOUNDS
Published: 01 February 2001
TABLE 1. UNIT-CELL DATA OF HILGARDITE-RELATED COMPOUNDS
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Photograph of a bundle of walkerite fibers 6 mm in length, capped by hilgar...
Published: 01 December 2002
Photograph of a bundle of walkerite fibers 6 mm in length, capped by hilgardite. Photograph by Q. Wight.
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μXRPD identification of a <span class="search-highlight">hilgardite</span>-3 A  and kurgantaite mixture by profil...
Published: 01 April 2014
F ig . 7. μXRPD identification of a hilgardite-3 A and kurgantaite mixture by profile fitting of calculated XRPD patterns.
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μXRPD identification of a <span class="search-highlight">hilgardite</span>-1 A  and kurgantaite mixture by profil...
Published: 01 April 2014
F ig . 8. μXRPD identification of a hilgardite-1 A and kurgantaite mixture by profile fitting of calculated XRPD patterns.
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Selected framework borate structures; ( a ) diomignite; ( b ) <span class="search-highlight">hilgardite</span>-1 ...
Published: 01 August 2014
F ig . 10. Selected framework borate structures; ( a ) diomignite; ( b ) hilgardite-1 A ; ( c ) boracite; ( d ) pringleite. Legend as in Fig. 6 .