sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Color ranges from white to yellowish-brown due to iron oxide staining. Luster is vitreous to greasy. Crystal structure is trigonal (microcrystalline or massive in pebble form). Conchoidal fracture, no cleavage. Specific gravity is approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Color ranges from white to yellowish-brown due to iron oxide staining. Luster is vitreous to greasy. Crystal structure is trigonal (microcrystalline or massive in pebble form). Conchoidal fracture, no cleavage. Specific gravity is approximately 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks like granite or quartzite. Over millions of years, water transport in rivers or ocean waves rounds the fragments into smooth pebbles.
Uses & applications
Used in landscaping, decorative stone, construction aggregates, and aquarium substrates.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust. Its high resistance to chemical and mechanical weathering allows it to survive long transport distances.
Field identification & locations
Found globally in riverbeds, beaches, and alluvial deposits. Easily identifiable by its high hardness (scratches glass) and lack of cleavage.
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