sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 7 on Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, conchoidal fracture.
Formation & geological history
Formed via weathering and mechanical erosion of igneous or metamorphic parent rocks, then transported and rounded by water in streams or marine environments.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and glass production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape found abundantly in riverbeds and beaches.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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