Hilgardite-4M
A structural variant of Hilgardite
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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.
Monoclinic polytype of Hilgardite.
Originally described from Choctaw Salt Dome, Iberville Parish, Louisiana, USA.
Unique Identifiers
Mindat ID:
9763
Long-form identifier:
mindat:1:1:9763:1
GUID
(UUID V4):
(UUID V4):
cc1c1c5f-99e2-47d4-a711-e90651c3c45f
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)°
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.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.859 Å | (100) |
| 2.839 Å | (100) |
| 2.113 Å | (80) |
| 2.109 Å | (80) |
| 2.096 Å | (80b) |
| 1.985 Å | (80) |
| 2.755 Å | (60) |
Comments:
Choctaw salt dome, Louisiana, USA.
Other Language Names for Hilgardite-4M
Russian:Хилгардит-4M
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:
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. The Canadian Mineralogist: 24: 689-693.
Internet Links for Hilgardite-4M
mindat.org URL:
https://www.mindat.org/min-9763.html
Please feel free to link to this page.
Please feel free to link to this page.
Mineral Dealers:
Localities for Hilgardite-4M
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada | |
| 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 | |
| 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 | |
| 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. |
