metamorphic
Green Quartzite
Quartzite (SiO2 with inclusions)
Hardness: 7 (Mohs scale), Color: Pale green to grey-green, Luster: Vitreous to dull, Structure: Non-foliated granoblastic, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale green to grey-green, Luster: Vitreous to dull, Structure: Non-foliated granoblastic, Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The green tint is often caused by trace inclusions of fuchsite (green muscovite mica) or chlorite minerals.
Uses & applications
Used as decorative stone in landscaping, crushed stone for construction, and occasionally for high-end countertops or lapidary carving.
Geological facts
Quartzite is so durable that it can outlast the mountains it belongs to; it often forms prominent ridges because it resists weathering much better than surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and its grainy, sandpaper-like texture that has been fused into a solid mass. It does not fizz with acid. Found in mountainous metamorphic belts worldwide.
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