Banded Calcite (often sold as 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Red Sandstone with Reduction Spot
Quartzose Sandstone with a Leach/Reduction Spot
sedimentary
Diamond
Carbon (C)
gemstone
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich sandstone or laterite fragment
Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Blue calcite (probable)
Calcite, calcium carbonate (CaCO₃)
mineral
Granite
Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Iron-stained garnet-bearing rock, possibly almandine garnet
Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix
mineral
Rose quartz heart
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Uraninite (Pitchblende)
Uranium dioxide (UO2)
mineral
Diamond
Diamond (C)
mineral
Diamond
Carbon (C)
mineral
Sandstone (Red Sandstone)
Arenite (primarily Quartz with Hematite cement)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fulgurite
Fulgurite (Lechatelierite / Vitreous Silica)
mineral
Chalcedony (Fire Agate or Carnelian variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone Pebble (River Cobble)
Arenite (Sandstone)
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Rough Diamond
Carbon (C)
gemstone
Mixed river gravel (alluvial conglomeratic sediment)
Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary