Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Metamorphic
Browse igneous, sedimentary, metamorphic 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
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Yellow variety)
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Pyrite
Iron Pyrite (FeS₂)
Mineral
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Polished fossil coral
Fossilized coral, commonly agatized coral (silica replacing CaCO₃)
fossil
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Garnet Gneiss
Garnetiferous quartzo-feldspathic gneiss
metamorphic
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral
Tumbled quartz pebble, possibly citrine or pale smoky quartz
Quartz (SiO₂), likely microcrystalline/tumbled material
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Magnetite
Magnetite (Fe3O4)
mineral
Rough amber-colored quartz or calcite fragment
Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz with Iron Inclusions
SiO2
mineral
Milky Quartz/White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (SiO2)
sedimentary
Quartz River Rock
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral