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Leucophosphite with Hureaulite & Jahnsite etc.

#BN48768

Leucophosphite with Hureaulite & Jahnsite etc.

#BN48768
Availability
Sold
Size
7.5 x 5.5 x 4 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 fabulous Tip Top mine specimen with several minerals forming great microcrystals. The Leucophosphite can be seen in the photos as glassy purple crystals to 2mm. The Leucophosphite is color-changing from light brownish tan to purple depending upon the lighting. The Hureaulite is the salmon colored pointed crystals, and the Jahnsite is the amber brown crystals. There is also a little bit of Tavorite (green) and Rockbridgeite in the matrix. There is possibly a bladed crystal of Vivianite of which I could not get a good color to know for sure.

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.

Collection
Dr. Buford Nichols Collection

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