sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, trigonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, trigonal crystal system, conchoidal fracture.
Formation & geological history
Formed through the weathering and prolonged aqueous erosion of quartz-bearing rocks, often found in sedimentary riverbeds and beaches.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving weathering that destroys other minerals.
Field identification & locations
Easily identified by its high hardness, conchoidal fracture, and resistance to acid; commonly found worldwide in alluvial deposits.
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Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sandstone
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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