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Stilpnomelane

#39261
SOLD
Stilpnomelane from Blanchard Hill, Bellingham, Skagit Co., Washington - 39261
Stilpnomelane from Blanchard Hill, Bellingham, Skagit Co., Washington - 39261

Stilpnomelane

#39261
Availability
Sold
Size
5 x 3.5 x 3.5 cm - Miniature 
Formula
(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36·nH2O (RRUFF)
Locality
Blanchard Hill, Bellingham, Skagit Co., Washington

Shiny black radial crystal groups in matrix.

Stilpnomelane

Formula
(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36·nH2O 
Crystal System
Triclinic 
Crystal Habit
Fibrous, Foliated, Platy 
Cleavage
Perfect, None, None 
Luster
Vitreous - Dull 
Color
brown red, green, golden brown, black 
Streak
gray white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
3 

Data courtesy of Webmineral.

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