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Hilgardite-4M

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System:
Monoclinic
A polytype of Hilgardite

Monoclinic polytype of Hilgardite.

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

Classification of Hilgardite-4M

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Crystallography of Hilgardite-4M

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 Volume:
V 820.79 ų (Calculated from Unit Cell)
Morphology:
Euhedral, almost equant crystals.
Comment:
Space group Aa.

Other Names for Hilgardite-4M

Name in Other Languages:

Other Information

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-4M

Reference List:
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-4M

Localities for Hilgardite-4M

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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