metamorphic
Green Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Sage green to grey-green; Luster: Vitreous/Glassy when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.8.
- Hardness
- 7 on Mohs scale
- Color
- Sage green to grey-green
- Luster
- Vitreous/Glassy when polished
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Physical properties
Hardness: 7 on Mohs scale; Color: Sage green to grey-green; Luster: Vitreous/Glassy when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.8.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The green color is often due to the presence of mineral inclusions like fuchsite or chlorite. This specimen appears water-worn or mechanically tumbled.
Uses & applications
Commonly used in landscaping, as decorative aggregate, in construction (crushed stone), and as a gemstone for tumbling, beads, and cabochons.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks; it typically forms the peaks of mountain ranges. It is harder than steel and will easily scratch a glass bottle.
Field identification & locations
Identify by its extreme hardness and grainy but fused 'sugary' texture. Commonly found in metamorphic belts worldwide. Collectors look for vibrant colors or 'aventurine' effects caused by mica inclusions.
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