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Mineralpedia Details for Holmquistite

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Holmquistite

Holmquistite

Named for Per Johan Holmquist, a Swedish petrologist. Holmquistite is a rare mineral that occurs as a metasomatic replacement near that outside of lithium-rich pegmatites. Localities fo Holmquistite are found in Sweden, Austria, the United States includeing here in the Black Hills of South Dakota in the Keystone area, Canada, Zimbabwe, South Africa, and Australia, among only a couple others. Minerals assocaited with Holmquistite include quartz, clinoholmquistite, tourmaline, spodumene, plagioclase, biotite, clinozoisite, and tourmaline.

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

Formula
[ ]Li2(Mg3Al2)Si8O22(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue, violet, light blue, dark violet, black 
Streak
bluish white 
Class
Orthorhombic - Dipyramidal 
Hardness
5.5 
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Holmquistite from Quebec Lithium mine, Barrault, Quebec, Canada

Holmquistite
            from Quebec Lithium mine, Barrault, Quebec, Canada

Bluish grey compact, acicular crystals of this rare lithim member of the amphibole group.

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Holmquistite from Koktokay pegmatite field, Fuyun Co., Aletai Pref., Xinjiang, China

Holmquistite
            from Koktokay pegmatite field, Fuyun Co., Aletai Pref., Xinjiang, China

Bluish black radiating groups of Holmquistite crystals to over 2cm long. Holmquistite is a lithium amphibole sometimes found in schist wall-rock adjacent to lithium bearing pegmatites. It is in this case a metasomatic product or at least fluid - wall rock interaction.

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