Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Red Sandstone
Ferruginous Sandstone
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Weathered reddish-brown rock fragment
Probably altered basalt or fine-grained volcanic rock; exact identification requires testing
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Dark vesicular volcanic rock, likely basaltic scoria
Scoria (vesicular basalt; composition commonly plagioclase, pyroxene, and iron-rich glass)
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Unakite (likely epidote–feldspar rock)
Epidote–K-feldspar–quartz aggregate; commonly approximated as pink orthoclase/microcline + green epidote + quartz
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Green aventurine (likely)
Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite
mineral
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Botryoidal chalcedony (possibly agate/geode material)
Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)
sedimentary
Pink Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Sandstone
Arenite (typically SiO2 + others)
sedimentary
Quartzite (Ferruginous Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
metamorphic
Basalt (Pahoehoe texture)
Mafic Volcanic Rock
igneous
Quartzite Pebble
Quartzite (SiO2 with minor impurities)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous