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Mineralpedia Details for Englishite

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Englishite

Englishite

Named in honor of George Letchworth English, who was an American mineral dealer and collector from New York City, New York, USA. Englishite can be found only in the United States in three states: in Little Green Monster mine at the type locality in Clay Canyon, Utah, in Nevada at the Meikle, Carlin, Gold Quarry, and Redhouse mines in Nevada, and here in the Black Hills of South Dakota in the Tip Top mine. Englishite occurs in variscite nodules in the Little Green Monster mine, and in the complex granite pegmatite at the Tip Top mine.

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

Formula
K3Na2Ca10Al15(OH)7(PO4)21ยท26H2
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Aggregates, Friable 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Sphenoidal 
Hardness
WebMineral
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Mindat
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Englishite from Tip Top mine, Custer Co., South Dakota, United States

Englishite
            from Tip Top mine, Custer Co., South Dakota, United States

Englishite "balls" to about 0.75mm and sprays of clear Montgomeryite to 2mm and deep green Roscherite. Beryl matrix.

Click thumbnail images for larger view.

Englishite from Little Green Monster mine, Clay Canyon, Fairfield, Utah Co., Utah, United States

Englishite
            from Little Green Monster mine, Clay Canyon, Fairfield, Utah Co., Utah, United States

Cluster of platy bluish Englishite 2mm in a cavity associated with the typical nodular assemblage of Wardite and Crandallite etc.

Click thumbnail images for larger view.

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