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Bermanite on Hureaulite

#40560
SOLD
Bermanite from Tip Top mine, Custer Co., South Dakota, United States - 40560
Bermanite from Tip Top mine, Custer Co., South Dakota, United States - 40560

Bermanite on Hureaulite

#40560
Availability
Sold
Size
3.5 x 2.5 x 2.5 cm - Miniature 
Formula
Mn2+Mn3+2(PO4)2(OH)2·4H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate

You get to looking at this specimen and it is really cool. Basically it is of tiny deep red Bermanite crystals which are probably less than 0.2mm in size grown on the much "larger" 3-5mm dark red Hurealite crystals. The Hureaulite however was in the process of being pseudomorphed by what looks like Jahnsite as portions of some of the Hureaulite crystals are yellow. Also in association are blobs of black Rockbridgeite clusters lurking in the shadows deep in the vug.

Bermanite

Formula
Mn2+Mn3+2(PO4)2(OH)2·4H2O 
Crystal System
Monoclinic 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous - Resinous 
Color
light red, dark reddish brown 
Class
Monoclinic - Sphenoidal 
Fracture
Brittle 
Hardness
3.5 

Data courtesy of Webmineral.

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