mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, yellowish-tan to grayish-brown color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on Mohs scale, yellowish-tan to grayish-brown color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments. Weathered and rounded through water transport in rivers or ocean shores over thousands to millions of years.
Uses & applications
Commonly collected as river rocks, used in landscaping, construction aggregates, or tumbled for lapidary hobbies.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust. Rounded stream pebbles like this demonstrate mechanical weathering over time.
Field identification & locations
Can be identified by its hardness (scratches glass readily), smooth rounded shape from erosion, and lack of true cleavage. Found worldwide in riverbeds, beaches, and gravel deposits.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral