Protocal ya utambuzi moja wapo ni
texture, Shape, na eyer observation. Hivyo ni ngumu kutambua kwa uhakika kwa picha ila hiyo jiwe la blue ni Amethyst na hiyo jiwe la rangi ya dhahabu naweza nkaiita Fools gold kwa lugha nyepesi, hizo nyekundu inaweza ikawa spinel au ruby pegmatites
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