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Leucophosphite with Jahnsite & Rockbridgeite

#55035

Leucophosphite with Jahnsite & Rockbridgeite

#55035
Availability
Sold
Size
8 x 7 x 3 cm - Sm Cabinet 
Formula
KFe3+2(PO4)2(OH)·2H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

A difficult subject to photo since there is such depth of field. The micro crystals number in the thousands, The yellowish crystals in the photos are mostly Leucophosphite but some are Jahnsites. They are all about the same size, which is tiny....about 0.3mm. Some are striated, and these are Jahnsite crystals. The remainder is acicular Rockbridgeite. There is also secondary green and formless Leucophosphite, which is a replacement of Triphylite.

Leucophosphite

Formula
KFe3+2(PO4)2(OH)·2H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Dull 
Color
brown, brownish yellow, colorless, greenish, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5 

Data courtesy of Webmineral.

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