Amethyst
Cov khoom
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Amethyst yog lub hnub yug ntawm Lub Ob Hlis thiab ua cim kev ntseeg siab
Amethyst yog ib qho siv lead ua tripartite, cov siv lead ua yog hexagonal columnar, cylindrical nto yog transverse, muaj sab laug thiab txoj cai zoo, ntxaib-krystal yog ntau heev.Lub hardness yog 7. Cov siv lead ua feem ntau muaj cov tsis xws luag los yog tis-kua kua inclusions.
