National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Porcelanite - a rare material of polished stone artefacts
Šrein, Vladimír ; Šťastný, Martin ; Šreinová, B. ; Langrová, Anna ; Kolman, Blahoslav Jan
Contact metamorphism is effected by heat supply at the contacts of rocks with magmatites. This process produces porcelanite, vitrification of sandstones and burning of coal seans, among other things. In detail mineralogical study we determined calcic feldspar and pyroxenes as a major minerals with titanite, calcite, zeolite, analcime and others.
Eclogite - a material of polished stone artefacts of the west Bohemia
Šreinová, B. ; Šrein, Vladimír ; Šťastný, Martin ; Kolman, Blahoslav Jan
The fragments of the three eclogitic hammers were originally a river cobble. The fragments are very rare type within the whole western Bohemia.

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