metamorphic
Green Quartzite
Metamorphic Quartz (SiO2) with Chromium-rich inclusions (Fuchsite)
Hardness: 7 on Mohs scale; Color: Pale to grayish-green; Luster: Vitreous to dull; Crystal structure: Trigonal (granular); Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Pale to grayish-green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale to grayish-green; Luster: Vitreous to dull; Crystal structure: Trigonal (granular); Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone subjected to extreme heat and pressure, causing recrystallization of sand grains. The green hue often results from chromium-bearing mica inclusions.
Uses & applications
Used in construction as decorative stone, crushed stone for road beds, landscaping, and occasionally as a gemstone for cabochons or carvings.
Geological facts
Quartzite is so durable that it can outlast the mountains it creates. It is often mistake for marble, but can be distinguished by its superior hardness - it easily scratches glass.
Field identification & locations
Identified by its sugary, granular texture and extreme hardness. Commonly found in folded mountain ranges across Brazil, India, and the United States (Appalachians).
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