metamorphic
Green Quartzite
Quartzite (SiO2 with minor impurities such as fuchsite or chlorite)
Hardness: 7 on the Mohs scale, Color: Pale to vibrant green (often due to chromium-bearing micas like fuchsite), Luster: Vitreous to greasy, Crystal structure: Trigonal (microcrystalline quartz grains fused together), Specific gravity: 2.65
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Physical properties
Hardness: 7 on the Mohs scale, Color: Pale to vibrant green (often due to chromium-bearing micas like fuchsite), Luster: Vitreous to greasy, Crystal structure: Trigonal (microcrystalline quartz grains fused together), Specific gravity: 2.65
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high temperatures and pressures usually associated with regional metamorphism during mountain-building processes.
Uses & applications
Used in architectural building stone, decorative tiles, landscaping, and occasionally as a gemstone or in lapidary arts for carvings.
Geological facts
Unlike sandstone which can break apart between grains, quartzite fractures across the grains because the quartz crystals recrystallize and interlock strongly during metamorphism.
Field identification & locations
Identified by its hard, sugary texture that does not fizz with acid and scratches glass easily. Found in mountainous regions and ancient cratons worldwide.
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