File:Mullite, Cordierite, Tridymite - Bohemia, Czech Republic.jpg

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Description
English: Mullite, cordierite, tridymite (size: 2.5" x 1.5" x 1")
Locality: Česká Kamenice, Děčín (Tetschen), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic
original description: Specimen of "porcelainite" - a semivitrified chert- or jasper-like rock composed of cordierite, mullite and tridymite, admixture of corundum, and subordinate K-feldspar. The porcelain quality of this mineral is caused by contact with heated basalt or, in this case, a burning coal seam.
Porcelainite was used for tools in prehistory, and is sometimes cut/polished for jewelry.
Deutsch: Mullit, Cordierit, Tridymit (Größe: 2,5" x 1,5" x 1")
Fundort: Česká Kamenice, Děčín (Tetschen), Region Ústí, Böhmen, Tschechien
Source http://www.mindat.org/photo-314690.html
Author John Krygier

Licensing

Public domain This work has been released into the public domain by its author, John Krygier. This applies worldwide.
In some countries this may not be legally possible; if so:
John Krygier grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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current12:40, 24 June 2010Thumbnail for version as of 12:40, 24 June 20101,024 × 768 (190 KB)wikimediacommons>Ra'ike== {{int:filedesc}} == {{Information |Description= {{en|Mullite, cordierite, tridymite (size: 2.5" x 1.5" x 1") ::Locality: Česká Kamenice, Děčín (Tetschen), Ústí Region, Bohemia (Böhmen; Boehme

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