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Mineralpedia Details for Florencite-(Ce)

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Florencite-(Ce)

Florencite-(Ce)

Brazilian mineralogist Dr. William Florence is the namesake of the mineral Florenceite for his early analysis of the mineral. The varietal suffix is for the dominance of the element cerium over other rare earth elements. Florencite-Ce is uncommon, formed as an aplite weathering product in argillized igneous rocks, is authigenic in shale and sandstone, and forms as a reaction between guano-reacted water with gabbros. Florenceite Group has many localities but chemical analysis is required at many localities to determine which species is/are present. Confirmed Florenceite-Ce localities include in Brazil, Canada, Belgium, Wales, Chile, on Ascension Island, Namibia, Malawi, Australia, as well as in marine sediments, and other localities.

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

Formula
CeAl3(PO4)2(OH)6 
Crystal System
Trigonal 
Cleavage
Good, None, None 
Luster
Resinous - Greasy 
Color
colorless, gray, light yellow, pink 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
5-6 
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Florencite-(Ce) from Brumado, Bahia, Brazil

Florencite-(Ce)
            from Brumado, Bahia, Brazil

Well-formed crystal to 6mm on Magnesite matrix.

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