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Mineralpedia Details for Ralstonite

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Ralstonite

Ralstonite

Named for Reverend J. Grier Ralston of Pennsylvania, USA, who was the first to observe the mineral. It occurs in granite pegmatites that are fluorine bearing as well as in antimony deposits of hydrothermal origin within silicified limestone. Quite a few localities including in Greenland, the USA, Bolivia, Australia, Norway, Italy, Ukraine, Kazakhstan, Russia, and others. 

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

Formula
Na0.5(Al,Mg)2(F,OH)6┬ĚH2
Crystal System
Isometric 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous - Greasy 
Color
colorless, white 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Uneven 
Hardness
4.5 
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Ralstonite from Ivigtut Cryolite deposit, Ivigtut, Arsuk Fjord, Sermersooq, Greenland

Ralstonite
            from Ivigtut Cryolite deposit, Ivigtut, Arsuk Fjord, Sermersooq, Greenland

Colorless, but stained by iron, octahedral crystals of Ralstonite to 2mm.

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