metamorphic
Green Quartzite
Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite
Hardness: 7 (Mohs scale); Color: Sage to deep forest green; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (granular/massive texture); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.8
- Hardness
- 7 (Mohs scale)
- Color
- Sage to deep forest green
- Luster
- Vitreous to dull/waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Sage to deep forest green; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (granular/massive texture); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.8
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone. High heat and pressure Recrystallize quartz grains into a dense, intertwined structure. The green hue usually comes from chromium-rich mica (fuchsite) or chlorite inclusions.
Uses & applications
Used in decorative landscaping, kitchen countertops, architectural stone, and occasionally carved into beads or figurines for the gemstone market.
Geological facts
Quartzite is so tough that it often survives intense weathering that destroys other rocks. When broken, quartzite fractures through the quartz grains rather than around them (unlike sandstone).
Field identification & locations
Identify in the field by its significant hardness (it will easily scratch glass) and its sugary, granular texture that sparkles under light. Commonly found in mountainous regions or ancient shield areas like the Appalachians, Himalayas, or Brazilian highlands.
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