mineral

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Hardness: 7 (Mohs scale); Color: Pale to deep forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Pale to deep forest green
Luster: Vitreous to waxy

Identified February 21, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Pale to deep forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or metamorphic rocks where secondary minerals like chlorite or actinolite are included during crystal growth. Can be found in Precambrian to Cenozoic formations depending on locality.

Uses & applications

Used primarily for lapidary work, cabochons for jewelry, decorative carvings, and as a metaphysical or collector's specimen.

Geological facts

Green quartz is often confused with prasiolite (heat-treated amethyst), but natural green quartz like this usually gets its color from macro-inclusions of green minerals rather than iron ions in the crystal lattice.

Field identification & locations

Identify by its 7-level hardness (scratches glass), conchoidal fracture, and non-foliated mass. Commonly found in Brazil, India, and parts of the Western United States. Collectors look for saturation of color and clarity.

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