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Mineralpedia Details for Crandallite

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Crandallite

Crandallite

Named for Milan L. Crandall Jr., a mining engineer from Utah, USA. Crandallite is an uncommon mineral that occurs “in weathered phosphatic aluminous sedimentary rocks and carbonatites, in phosphate-rich nodules, from complex granite pegmatites, in amphibolites-grade metaquartzites, [and as] an authigenic mineral in anoxic marine sediments or in clay-rich sediment beneath a tropical swamp.” Localities for Crandallite are found in the United States including here in the Black Hills of South Dakota at the Tip Top, Wharf, Everly, and Hugo mines, Brazil, Belgium, Germany, England, Ireland, Russia, Australia, and Rwanda.

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

Formula
CaAl3(PO4)(PO3OH)(OH)6 
Crystal System
Trigonal 
Crystal Habit
Compact, Massive - Granular, Fibrous 
Cleavage
Perfect, None, None 
Luster
Vitreous - Dull 
Color
gray, yellow, yellowish white, light red 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Hardness
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Crandallite from Mont-des-Groseillers, Blaton, Mons, Henegouwen, Belgium

Crandallite
            from Mont-des-Groseillers, Blaton, Mons, Henegouwen, Belgium

Tan, radial, flat crystals to 1cm in diameter.

Click thumbnail images for larger view.

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