Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)
Browse igneous, metamorphic, and sedimentary (mixed assemblage) specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Mixed rock fragments, likely basalt and weathered granite
Basalt (mafic volcanic rock) and granitic fragments (quartz–feldspar–mica aggregate)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Hematite
Iron Oxide (Fe2O3)
mineral
Mixed collection of tumbled minerals and rough specimens
Multiple species visible; likely fluorite, quartz/chalcedony, pyrite, tiger’s eye, rose quartz, and possibly labradorite or agate
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pebble Gravel Mix (Quartzite, Basalt, Chert)
Alluvial River Gravel / Aggregate Clasts
sedimentary
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Likely gray granite fragment
Granite, composed mainly of quartz, feldspar, and mica
igneous
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Variant)
Silicon Dioxide (SiO2)
mineral
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz (Clear Quartz / Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Weathered rounded cobble
Indeterminate lithology; likely weathered sandstone or volcanic rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral