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Hureaulite with Jahnsite-(CaMnMg)

#40440

Hureaulite with Jahnsite-(CaMnMg)

#40440
Availability
Sold
Size
6 x 4 x 3 cm - Sm Cabinet 
Formula
Mn2+5(PO4)2(PO3OH)2·4H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Salmon pink crystals of Hureaulite to 7mm on Jahnsite. The Tip Top mine is a granitic differentiated-zoned pegmatite with rare elements lithium and beryllium. Primary phosphates occur as large nodules which were later attacked by metasomatic activity, which were probably derived from late-stage end-fluids.

Hureaulite

Formula
Mn2+5(PO4)2(PO3OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Massive, Compact, Fibrous 
Cleavage
Distinct, None, None 
Luster
Vitreous - Greasy 
Color
red, white, grayish white, yellowish white, reddish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness

Data courtesy of Webmineral.

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