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Whitlockite - Bobdownsite with Montgomeryite

#44302

Whitlockite - Bobdownsite with Montgomeryite

#44302
Availability
Sold
Size
5 x 4 x 2 cm - Miniature 
Formula
Ca9Mg(PO4)6(PO3OH) (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate

Faint lilac Whitlockite/Bobdownsite. Note that all Whitlockite I sent RRUFF has been identified by Raman as Bobdownsite. The crystals are as tiny rhombs with carbonate apatite, which my be the underlying lilac color. Also in association are red Montgomeryite crystals.

Whitlockite

Formula
Ca9Mg(PO4)6(PO3OH) 
Crystal System
Trigonal 
Crystal Habit
Rhombohedral Crystals, Tabular, Pistolitic 
Cleavage
None, None, None 
Luster
Vitreous - Resinous 
Color
colorless, gray, gray white, yellowish, white 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Uneven 
Hardness

Data courtesy of Webmineral.

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