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Olmsteadite

#51793

Olmsteadite

#51793
Availability
Sold
Size
1.5 x 1.2 x 1.2 cm - Thumbnail 
Formula
KFe2+2NbO2(PO4)2·2H2O (RRUFF)
Locality
White Cap mine, Pennington Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Siderite and smoky Quartz matrix with one little area of around 1mm with a root-beer colored Olmsteadite crystal. The crystal shows faces and is striated. The color is unusual and distiguished from tiny orange crystals elsewhre in the matrix, which are secondary Sphalerite crystals.

Type Locality

Olmsteadite

Formula
KFe2+2NbO2(PO4)2·2H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Good, Good, None 
Luster
Subadamantine 
Color
brown, reddish brown, black 
Streak
olive green 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness

Data courtesy of Webmineral.

Special Info
Type Locality

Other Sold

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