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Zussmanite & Deerite

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PDM575703

Zussmanite & Deerite

Type Locality

Description Tabs

Description
Locality: 
Laytonville Quarry, Laytonville, Mendocino County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 3.7 × 2.3 cm
Description

Piece of metamorphic rock with bottle-green grains of zussmanite crystals, black micaceous stilpnomelane flakes and black prismatic to acicular crystals of deerite, included in quartz. The Laytonville Quarry is the type locality of zussmanite and deerite. Ex. Bob Janssens type locality’s collection (#LT1805).

 

Mineral Data
What's on the rock

Zussmanite

Formula: 
K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
Strunz: 
9.EG.35
Hardness: 
0.0
Type Locality: 
Laytonville Quarry ("Longvale"; "Longvale Quarry"), Laytonville, Coastal Range, Mendocino Co., California, USA...

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...

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