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Mineralpedia Details for Verplanckite

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Verplanckite

Verplanckite

William E. Ver Planck, a geologist for the California Division of Mines and Geology in California, USA has the mineral Verplanckite named for him. It is found in metamorphic canbornite-quartz rocks as thin layers in only one locality in the world, its type locality, at the Esquire No. 7 claim in California.

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

Formula
Ba4Mn2+2Si4O12(OH,H2O)3Cl3 
Crystal System
Hexagonal 
Crystal Habit
Radial, Prismatic, Aggregates 
Cleavage
Good, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
brownish yellow, brownish orange 
Streak
light orange 
Class
Hexagonal - Dihexagonal Dipyramidal 
Hardness
2.5-3 
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Verplanckite from Esquire #7 claim, Big Creek, Fresno Co., California, United States

Verplanckite
            from Esquire #7 claim, Big Creek, Fresno Co., California, United States
Special Info
Type Locality

Verplanckite occurs in metamorphic quartz-sanbornite rock with other rare barium silicates. The occurence is thus far the only reported occurence. Verplanckite is a barium silicate with essential manganese but also may contain iron and titanium. As the photos show, the mineral crystalizes in minute reddish-brown prisms mostly with crude crystal outlines in sanbornite rich rock. The crystals in this specimen measure about 1mm and less.

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