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Stilpnomelane

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LAM772493

Stilpnomelane

Classic Locality

Description Tabs

Description
Locality: 
Blanchard Hill, Skagit County, Washington, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5 × 5 cm
Weight: 
140.00gr
Description

Groups of black radiating crystals of stilpnomelane on quartz matrix

Mineral Data
What's on the rock

Stilpnomelane

Formula: 
(K,Ca,Na)(Fe2+,Mg,Al,Fe3+)8(Si,Al)12(O,OH)36·nH2O
Strunz: 
9.EG.40
Hardness: 
3.0 - 4.0
Type Locality: 
Melchior and Tobias adits, Horní Údolí (Obergrund), Zlaté Hory (Zuckmantel), Olomouc Region, Moravia (Mähren; Maehren), Czech Republic

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