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kremeň
Record number d011791 Date 06.06.2025 Type M - MESH Topical term kremeň UDC D01.578.750.600D01.650.550.825.600D01.837.725.600 Note Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed) 
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