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| View Original: | Mullite, Cordierite, Tridymite - Bohemia, Czech Republic.jpg (1024x768) | |||
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| Keywords: Mullite, Cordierite, Tridymite - Bohemia, Czech Republic.jpg 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 Mullit Cordierit Tridymit Größe 2 5 x 1 5 x 1 Fundort Česká Kamenice Děčín Tetschen Region Ústí Böhmen Tschechien http //www mindat org/photo-314690 html http //www mindat org/user-13767 html 0 John Krygier John Krygier Mullite Cordierite Tridymite Files by John Krygier from mindat | ||||
