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Mineralpedia Details for Wightmanite

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Wightmanite

Wightmanite

Wightmanite is named for Randall H. Wightman, the mining and exploration director at the Riverside Cement Company in Riverside, California, USA where Wightmanite also has its type locality. Found only in California, Wightmanite is a rare mineral that occurs only in contact metamorphosed limestone.

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

Formula
Mg5O(BO3)(OH)5ยท2H2
Crystal System
Monoclinic 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, light green 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
5.5 
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Wightmanite from Commercial quarry, Crestmore, Riverside Co., California, United States

Wightmanite
            from Commercial quarry, Crestmore, Riverside Co., California, United States Slender long, fibrous crystals in marble matrix to over 1cm.
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