Hilgardite-4M
A structural variant of Hilgardite
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Eugene W. Hilgard
Formula:
Ca2B5O9Cl · H2O
Crystal System:
Monoclinic
Name:
Named for Eugene Woldemar Hilgard (5 January 1833, Zweibrücken, Rhineland-Palatinate, Germany – 8 January 1916, Berkeley, California, United States), German-American geologist, one of the first to describe the Louisiana salt dome deposits. He is also considered the father of modern soil science in the United States.
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
Similar Names
| Hilgardite-1A | A synonym of Hilgardite-1Tc | |
| Hilgardite-3A | A synonym of Hilgardite-3Tc |
Chemistry of Hilgardite-4M
Mindat Formula:
Ca2B5O9Cl · H2O
Element Weights:
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.
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.
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References for Hilgardite-4M
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 | |
| Rachlin et al. (1986) |
Turkey | |
| Koçak et al. (2016) +1 other reference |
USA | |
| Ghose et al. (1979) +2 other references |
