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Mineralpedia Details for Mcallisterite

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Mcallisterite

Mcallisterite

Formula
Mg2[B6O7(OH)6]2ยท9H2
Crystal System
Trigonal 
Cleavage
Good, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellow brown, white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle 
Hardness
2.5 
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Mcallisterite from Hard Scramble claim, Inyo Co., California, United States

Mcallisterite
            from Hard Scramble claim, Inyo Co., California, United States

The Mcallisterite clusters are the white efflorescent product, which looks like popcorn. The colorless, acicular sprays are Gowerite. The specimen itself is semi-important if you look at the old tag and read the historical aspect of it. Apparently it is type material sent to Frondel, who sent the material to a Russian named Belov to work out the crystal structure.

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