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Deerite Howieite & Stilpnomelane

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CLB581231

Deerite Howieite & Stilpnomelane

Type Locality

Description Tabs

Description
Locality: 
Laytonville Quarry, Laytonville, Mendocino County, California, United States of America
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3 × 1.5 cm
Description

Black acicular deerite and  radiating, glossy black howieite with brown stilpnomelane.

Type locality of howieite and deerite.

Mineral Data
What's on the rock

Deerite

Formula: 
(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5
Strunz: 
9.DH.60
Crystal System: 
Monoclinic
Hardness: 
6.0
Colour: 
Black
Streak: 
Dark gray
Type Locality: 
Laytonville Quarry ("Longvale"; "Longvale Quarry"), Laytonville, Coastal Range, Mendocino Co., California, USA...

Howieite

Formula: 
Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Strunz: 
9.DH.65
Hardness: 
0.0
Type Locality: 
Laytonville Quarry ("Longvale"; "Longvale Quarry"), Laytonville, Coastal Range, Mendocino Co., California, USA...

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

Seller Information

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