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Metacinnabar

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PDM690175

Metacinnabar

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Description
Locality: 
Mount Diablo Mine, Clayton, Contra Costa County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 4.3 × 2.6 cm
Description

Dozens of dark red to black crystals of metacinnabar, an uncommon polymorph of cinnabar, reaching 2 mm in size, on a silicified matrix. They are clearly tetrahedral {111}, modified by {211}, with moderate lustre and very aerial.

From and old collection (N°379) dated before 1972.

Acquired in 1972 by René Virlet.

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