Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Schist
Mica Schist
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Fossilized oyster shell in limestone
Bivalvia fossil; chiefly calcite (CaCO₃)
fossil
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Small rounded pebble
Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Diamond
Natural Diamond (Carbon, C)
mineral
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
igneous
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Coal (Bituminous or Anthracite)
Organogenic Sedimentary Rock (Carbon)
sedimentary
Garnet
Nesosilicate group (e.g., Almandine: Fe3Al2(SiO4)3)
mineral
Sapphire
Corundum (Al2O3)
gemstone
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Sandstone (Ferruginous)
Arenite (Fe-oxide enriched)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Dyed Pink Agate (or Dyed Quartzite)
Silicon dioxide (SiO2) with artificial pigment
sedimentary
Banded Calcite (Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Pumice
Pumice (volcanic glass)
igneous
Amethyst and Limestone
Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)
The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).
Ruby (Raw Corundum)
Corundum (Al2O3 with Chromium impurities)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO₂)
mineral
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Biotite)
igneous