Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Quartzite and Sandstone Pebbles
Silicon dioxide (SiO2)
metamorphic and sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Coquina Limestone
Coquina (Calcium Carbonate, CaCO3)
sedimentary
Tumbled black stone, likely basalt
Basalt; fine-grained plagioclase–pyroxene rock, possibly with magnetite
igneous
Granite
Felsic intrusive igneous rock
igneous
Rose quartz
Quartz (silicon dioxide, SiO₂), pink massive variety
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), naturally irradiated variety
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Flint (or Chert)
Microcrystalline quartz (SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (varieties including Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations like Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Chert (Flint)
Chert (SiO2)
sedimentary
Diabase
Diabase (also known as Dolerite)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary