metamorphic
Quartzite with Quartz Vein
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, reddish-brown to pinkish color due to iron oxide staining, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, reddish-brown to pinkish color due to iron oxide staining, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, often reshaped and rounded by wave action as a beach pebble.
Uses & applications
Used in decorative landscaping, road construction, railway ballast, and occasionally as a gemstone or polished decorative stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why it often survives long journeys in riverbeds or ocean shores to become smooth pebbles.
Field identification & locations
Easily identified in the field by its extreme hardness (scratches glass easily), lack of reaction to acid, sugary texture on broken surfaces, and characteristic intersecting quartz veins.
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