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Köttigite & Legrandite Psm Köttigite

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CLB533873

Köttigite & Legrandite Psm Köttigite

ex collection Dr. Krassmann
Pseudomorph

Description Tabs

Description
Locality: 
Ojuela Mine, Mapimi, Durango, Mexico
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 2.3 × 1.2 cm
Description

Nice group of köttigite crystals on matrix. A closer look reveals that the köttigite crystals seem gto have been partly altered to legrandite - but that's just an assumption.

Mineral Data
What's on the rock

Köttigite

Formula: 
Zn3(AsO4)2·8H2O
Strunz: 
8.CE.40
Crystal System: 
Monoclinic Prismatic crystals or crusts
Hardness: 
2.5 - 3.0
Type Locality: 
Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Legrandite

Formula: 
Zn2(AsO4)(OH)·H2O
Strunz: 
8.DC.10
Crystal System: 
Monoclinic
Hardness: 
4.5
Streak: 
White
Type Locality: 
Flor de Peña Mine, Lampazos de Naranjo (Lampazos), Mun. de Lampazos de Naranjo, Nuevo Leon, Mexico

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