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Orientite & Ranciéite

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BCK808176

Orientite & Ranciéite

Dan Behnke collection
Rare Mineral

Description Tabs

Description
Locality: 
Manganese Mine, Copper Harbor, Keweenaw County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.7 × 1.9 cm
Description

You are bidding on a thumbnail sample with rich orange crystals of orientite in several vug in braunite matrix. There are also several shiny, golden spheres of rare rancieite in association. Rich sample collected by Dan in 1981 underground at the mine. One original slide scanned and shown here. 

This sample is from the collection of Dan Behnke, long-time friend, micromounter and prodigious photographer. I am pleased to be able to offer selections from his large collection, many of which are illustrated specimens in Rocks & Minerals, The Mineralogiocal Record, Photo Atlas of Minerals and many other publications. All samples from his meticulously catalogued collection will come with his original index card with all notes, photography annotations and other pertinent information, as well as any slides Dan may have taken of the sample with publication notes and date the photo was made.

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

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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