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Whitlockite on carbonate apatite

#PD40968

Whitlockite on carbonate apatite

#PD40968
Availability
Sold
Size
4 x 4 x 3.5 cm - Miniature 
Formula
Ca9Mg(PO4)6(PO3OH) (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

White to colorless rhombic crystals of Whitlockite to 3mm. It is probably Bobdownsite although would need to be tested. All Whitlockites I have sendt to RRUFF have turned out to be Bobdownsite.

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.

Collection
Phillips Collection

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