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Neltnerite & Ranciéite

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BCK887965

Neltnerite & Ranciéite

Rare Mineral

Description Tabs

Description
Locality: 
Manganese Mine, Copper Harbor, Keweenaw County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.6 × 1.2 cm
Description

You are bidding on a small sample with rare bladed crystals of neltnerite with golden, platy rancieite and red-brown macfallite. Collected by Dan Behnke and from his collection. 

Mineral Data
What's on the rock

Neltnerite

Formula: 
CaMn3+6(SiO4)O8
Strunz: 
9.AG.05
Crystal System: 
Tetragonal
Hardness: 
6.0
Colour: 
black
Streak: 
black
Type Locality: 
Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco

Ranciéite

Formula: 
(Ca,Mn)Mn4O9·3H2O
Strunz: 
4.FL.40
Crystal System: 
Hexagonal
Hardness: 
2.5 - 3.0
Type Locality: 
Le Rancié Mine, Sem, Vicdessos, Ariège, Midi-Pyrénées, France

Seller Information

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