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Macfallite & Orientite

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BCK514640

Macfallite & Orientite

Type Locality

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 × 1.3 × 1.3 cm
Description

You are bidding on one of the finest specimens I've personally seen of orientite from Michigan. Here crystals of macfallite and been overgrown by orientite so that the crystals appear hollow. This is an exceptional and photogenic sample of both minerals. 

Mineral Data
What's on the rock

Macfallite

Formula: 
Ca2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
Strunz: 
9.BG.15
Crystal System: 
Monoclinic
Hardness: 
5.0
Type Locality: 
Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA

Orientite

Formula: 
Ca2Mn2+Mn3+2(Si3O10)(OH)4
Strunz: 
9.BJ.05
Hardness: 
4.0 - 5.0
Type Locality: 
Firmeza District, Santiago de Cuba Province, Cuba

Seller Information

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