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Keywords from Image Description:
Mullite Cordierite Tridymite Bohemia Czech Republic. Specimen of porcelainite semivitrified chert or jasperlike rock composed of cordierite mullite and tridymite admixture of corundum and subordinate Kfeldspar The porcelain quality of this mineral is caused by contact with heated basalt or in this case burning coal seam Porcelainite