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Mineralpedia Details for Hilgardite

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Hilgardite

Hilgardite

Named after Eugene Woldemar Hilgard, who was a German-American geologist and one of the fisrt to study the Lousiana salt diapir/dome deposits. Hilgardite is a rare mineral that is found in marine evaporate deposits in localities in the United States in the Choctaw salt dome in Lousiana and in Mississippi and Alabama, in potash mines in Canada, Germany, England, salt domes in Kazakhstan, Russia, and at the Dead Sea in Israel. Hilgardite is piezoelectric, generates a charge in response to pressure.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hilgardite.pdf

Formula
Ca2B5O9Cl·H2
Crystal System
Triclinic 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Triclinic - Pedial 
Hardness
WebMineral
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Mindat
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Hilgardite from Boulby Potash mine, Loftus, Cleveland, England

Hilgardite
            from Boulby Potash mine, Loftus, Cleveland, England

Pink micro crystals of Hilgardite occuring with and in light blue cubic Boracite crystals.

Click thumbnail images for larger view.

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