Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Tumbled yellow calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Unidentifiable Rock Fragment
Uncertain
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Epidosite
Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})
metamorphic
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Sandstone Moqui Marble (Concretion)
Iron oxide concretion (Hematite/Goethite and Quartz)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Conglomerate Pebble (with Chert / Quartz)
Sedimentary Conglomerate / Breccia Pebble
sedimentary
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Sandstone (Silicon dioxide, SiO2 based)
sedimentary
Chert (often called Flint when dark)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Cubic Zirconia (Simulated Diamond)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
Diamond (in jewelry)
Carbon (C)
mineral
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Diamond (in jewelry setting)
Carbon (C)
mineral
Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Pegmatite with Black Tourmaline
Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous