Brushite is a phosphate mineral with the chemical formula
CaHPO4·2H2O. It forms colorless to pale yellow monoclinic prismatic
crystals and as powdery or earthy masses. It is the phosphate
analogue of the arsenate pharmacolite and the sulfate gypsum.
Discovery and occurrence
Brushite was first described in 1865 for an occurrence on Aves Island,
Nueva Esparta, Venezuela, and named for the American mineralogist
George Jarvis Brush (1831–1912). It is believed to be a precursor
of apatite and is found in guano-rich caves, formed by the interaction
of guano with calcite and clay at a low pH. It occurs in phosphorite
deposits and forms encrustations on old bones. It may result from
runoff of fields which have received heavy fertilizer applications.
Associated minerals include tanarakite, ardealite, hydroxylapatite,
variscite and gypsum.
Brushite is the original precipitating material in calcium phosphate
^ a b c
Brushite in the Handbook of Mineralogy
^ a b c
Brushite on Mindat.org
^ a b Webmineral data
^ "Brushite". Virtual Museum of Molecules and Minerals. Retrieved 22
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