green calcite crystal mineral isolted with white background

material mineralogical forsterite orthopyroxene tectosilicate clinopyroxene sulfur chloride raw gemology amethyst semiprecious quartz jewelery gemmology gemmological gemological crystalline rough stone nature natural green mineral rock gemstone geological gem geology isolated crystal macro calcite shiny closeup precious jewelry geologic emerald colorful blue healing crystals stones malachite rhodonite isolted white background