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Mineralpedia Details for Foggite

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Foggite

Foggite

Named after Forrest F. Fogg, a mineral collector from New Hampshire, USA and the first to provide the material for research. Foggite is a rare mineral that can be found in only three localities worldwide, at its type locality at the Palermo No. 1 mine in New Hampshire in the United States, in Romania at Cioclovina cave, and in Australia at Milgun Station. It is a secondary mineral that likely forms in granite pegmatites at temperatures less than 300 degrees Celsius.

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

Formula
CaAlPO4(OH)2┬ĚH2
Crystal System
Orthorhombic 
Cleavage
Perfect, Good, None 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Disphenoidal 
Hardness
WebMineral
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Mindat
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Foggite from Palermo mine, Groton, Grafton Co., New Hampshire, United States

Foggite
            from Palermo mine, Groton, Grafton Co., New Hampshire, United States

Creamy balls composed of platy crystals to 1mm. Foggite was first described by Paul Moore, a renowned expert on Palermo and phosphate, in 1975. Foggite, named after Forrest Fogg, can be confused with Crandallite or Fairfieldite. The best crystals occur as fans of plates much like an open book. .

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