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Orientite & Macfallite

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SKY818355

Orientite & Macfallite

Rare Mineral

Description Tabs

Description
Locality: 
Copper Harbor, Keweenaw County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1 × 0.7 cm
Description

Small brown sharp crystals of orientite (photos 1 and 2)  associated to massive macfalllite from Michigan.

Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium.

Mineral Data
What's on the rock

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

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

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