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Mineralpedia Details for Elpasolite

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Elpasolite

Elpasolite

Named for the type locality in St. Peters Dome in the Cheyenne district of El Paso (Elpaso) County in Colorado, USA. Elpasolite is a rare mineral that can be found in additional USA localities as well as in Italy, Greenland, Ukraine, Russia, and the Democratic Republic of the Congo. Elpasoite occurs as a replacement for fluorine minerals in quartz-microcline pegmatites and in quartz veins associated with hydrothermal antimony deposits in silicon rich limestone.

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

Formula
K2NaAlF6 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
colorless 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
2.5 
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Elpasolite from Le Cetine mine, Rosia, Siena, Tuscany, Italy

Elpasolite
            from Le Cetine mine, Rosia, Siena, Tuscany, Italy

Analcime looking, clear crystals to about 0.5mm in and on vuggy matrix associated with Gypsum.

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