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Köttigite & Legrandite

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MGR1022148

Köttigite & Legrandite

Rare Mineral

Description Tabs

Description
Locality: 
Ojuela Mine, Mapimi, Durango, Mexico
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 5.2 × 1.5 cm
Description

Typically, this rare hydrated zinc arsenate is not cute. When these were discovered between the sulfide and oxide zones, miners dubbed them “Legrandite Azul,” since the famous sunshine yellow mineral also came from the same zone. Originally found in Germany, the specimens from Ojuela put this member of the Vivianite group on collectors’ radar. The particular specimen shows not only this rare mineral - it also features this unique combination with legrandite

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