metamorphic
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
Hardness of 7 on the Mohs scale, greenish color due to impurities like chromium or chlorite, vitreous to greasy luster, non-foliated crystal structure, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, greenish color due to impurities like chromium or chlorite, vitreous to greasy luster, non-foliated crystal structure, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during regional or contact metamorphism, typically taking millions of years.
Uses & applications
Used in construction, as dimension stone, crushed stone for roadbeds, and occasionally for decorative items and cabochons in jewelry.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why mountains made of quartzite often stand out as high ridges.
Field identification & locations
Can be identified by its hardness (scratches glass), lack of reaction to acid, and sugary texture on freshly broken surfaces. Found worldwide in ancient orogenic belts.
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