mineral
Green Calcite or Prasiolite (Green Quartz)
Calcium carbonate (CaCO3) or Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 3 (calcite) or 7 (quartz). Light green color, vitreous luster. Calcite has rhombohedral cleavage, quartz has conchoidal fracture.
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Physical properties
Mohs hardness of 3 (calcite) or 7 (quartz). Light green color, vitreous luster. Calcite has rhombohedral cleavage, quartz has conchoidal fracture.
Formation & geological history
Calcite forms in sedimentary environments or hydrothermal veins. Prasiolite often forms by heat treating amethyst.
Uses & applications
Used in crystal healing, collecting, and sometimes faceted into jewelry (especially prasiolite).
Geological facts
Natural prasiolite is rare; most on the market is heat-treated amethyst. Green calcite gets its color from chlorite inclusions.
Field identification & locations
Identify calcite by its softness (scratches with copper penny) and cleavage. Quartz is much harder and scratches glass.
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