metamorphic
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
Hardness of 7 on the Mohs scale, pale to vivid green color due to impurities such as fuchsite or chlorite, vitreous to greasy luster, interlocking crystalline quartz structure, lacks distinct cleavage, specific gravity of approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, pale to vivid green color due to impurities such as fuchsite or chlorite, vitreous to greasy luster, interlocking crystalline quartz structure, lacks distinct cleavage, specific gravity of approximately 2.65.
Formation & geological history
Formed from quartz-rich sandstone or chert that has undergone intense regional or contact metamorphism under high temperatures and pressures, causing the quartz grains to recrystallize and fuse tightly together.
Uses & applications
Used widely as a decorative building stone, in interior design (countertops and wall cladding), landscaping, and occasionally as a gemstone or in sculpture.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it resists erosion much better than surrounding rocks like schist or shale.
Field identification & locations
Identified in the field by its sugary texture of interlocking quartz grains, hardness that easily scratches glass, and inability to effervesce with hydrochloric acid. Found worldwide in ancient orogenic belts.
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