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0 item @ $0.00  

Whitmoreite with Ludlamite

#62916

Whitmoreite with Ludlamite

#62916
Availability
Available
Price
$50.00
Size
6.5 x 5 x 4 cm - Sm Cabinet 
Formula
Fe2+Fe3+2(PO4)2(OH)2·4H2O (RRUFF)
Locality
Big Chief mine, Pennington Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Brown acicular crystals eminating from a round crystal. I have never seen analytics on the rounded center, but I assume they are also Whitmoreite. Bill Roberts once described the Whitmoreite crystals as "floating naval mines". There are several areas which show the Whitmorerite in a matrix of Ludlamite, Hureaulite, Phosphoferrite(?) and Arsenopyrite.

Whitmoreite

Formula
Fe2+Fe3+2(PO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Aggregates 
Cleavage
Good, None, None 
Luster
Vitreous - Adamantine 
Color
brown, greenish brown, light yellow brown, dark brown 
Class
Monoclinic - Prismatic 
Hardness

Data courtesy of Webmineral.

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