metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs), Color: Tan to yellowish-brown with translucent areas, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: Tan to yellowish-brown with translucent areas, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, often found in riverbeds or coastal areas as rounded pebbles due to water erosion.
Uses & applications
Commonly used in construction as crushed stone, road ballast, or decorative landscaping; also used as a polishing abrasive.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock layers during erosion, frequently forming the tops of prominent ridges or hills.
Field identification & locations
Identify by its hardness (scratches glass), sugary texture upon close inspection, and lack of reaction to acid. Often found in glacial till or river gravels.
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