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

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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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current11:40, 24 June 2010Thumbnail for version as of 11:40, 24 June 20101,024 × 768 (190 KB)Ra'ike (talk | contribs)== {{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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