metamorphic
Green Quartzite
Quartzite (SiO2 with chlorite/epidote inclusions)
Hardness: 7 on Mohs scale; Color: Dull grayish-green with translucent white areas; Luster: Vitreous to waxy; Structure: Granular, non-foliated; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Dull grayish-green with translucent white areas
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Dull grayish-green with translucent white areas; Luster: Vitreous to waxy; Structure: Granular, non-foliated; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone subjected to high heat and pressure. The green coloration typically comes from minor mineral impurities like chlorite, epidote, or fuchsite mica that were present during recrystallization.
Uses & applications
Used primarily as decorative stone, crushed stone for road construction, and occasionally for lapidary work like carvings or bookends due to its durability and color.
Geological facts
Quartzite is so durable that it often survives intense weathering that wears away surrounding softer rocks, often forming the crests of ridges and mountain ranges.
Field identification & locations
Identify by its ability to scratch glass easily and its lack of reaction to acid. In the field, it has a 'sugary' texture where individual quartz grains have fused together. Common in ancient mountain belts.
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