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Hilgardite-4M

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Crystal System:
Monoclinic
A polytype of Hilgardite

Monoclinic polytype of Hilgardite.

Originally described from Choctaw Salt Dome, Iberville Parish, Louisiana, USA.


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Crystallography of Hilgardite-4MHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Cell Parameters:
a = 11.470(3) Å, b = 11.321(4) Å, c = 6.321(5) Å
β = 90.02(7)°
Ratio:
a:b:c = 1.013 : 1 : 0.558
Unit Cell V:
820.79 ų (Calculated from Unit Cell)
Morphology:
Euhedral, almost equant crystals.
Comment:
Space group Aa.

Other Language Names for Hilgardite-4MHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hilgardite-4MHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ghose, S.(1985): A new nomenclature for the borate minerals in the hilgardite
(Ca2B5O9Cl*H2O)-tyretskite (Ca2B5O9OH * H2O) group. American Mineralogist. 70: 636-637.
Rachlin, A.L., Mandarino, J.A., Murowchick, B.L., Ramik, R.A., Dunn, P.J., and Back, M.E. (1986) Mineralogy of hilgardite-4M from evaporites in New Brunswick. Canadian Mineralogist. 24: 689-693.

Internet Links for Hilgardite-4MHide

Localities for Hilgardite-4MHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Mandarino, J.A., Murowchick, B.L., Ramik, R.A., Dunn, P.J. and Back, M.E. (1986): Mineralogy of hilgardite-4M from evaporites in New Brunswick. Canadian Mineralogist. 24, 689–693.
Turkey
 
  • Central Anatolia Region
    • Eskişehir Province
      • Kirka
Koçak, İ. & Koç, Ş. (2016): Geochemical characteristics of Kırka (Sarıkaya) borate deposit, northwestern Anatolia, Turkey. Journal of Earth System Science: 125: 147-164; http://forum.amiminerals.it/viewtopic.php?f=5&t=12548 (2016)
USA
 
  • Louisiana
    • Iberville Parish
      • Plaquemine
Ghose, S. & Wan, C. (1979): Hilgardite, Ca2[B5O9]Cl*H2O: a piezoelectric zeolite-type pentaborate. American Mineralogist. 64, 187-195; Ghose, S.(1985): A new nomenclature for the borate minerals in the hilgardite (Ca2B5O9Cl*H2O)-tyretskite (Ca2B5O9OH * H2O) group. American Mineralogist. 70: 636-637.
Mineral and/or Locality  
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