metamorphic
Quartzite
Metamorphic Quartz Sandstone
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated crystal structure with interlocking quartz grains.
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Physical properties
Hardness of 7 on Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated crystal structure with interlocking quartz grains.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, commonly in mountain-building orogenic belts.
Uses & applications
Used in construction, as crushed stone for road bases, in manufacturing railroad ballast, and for refractory bricks.
Geological facts
Quartzite is exceptionally resistant to weathering and erosion, often forming prominent ridges and mountain peaks.
Field identification & locations
Identified by its inability to be scratched by steel and its lack of effervescence with acid; found worldwide in ancient mountain roots.
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