Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Limestone
Calcite-rich sedimentary rock (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Quartzite (Iron-stained)
Quartzite (mostly SiO2)
metamorphic
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Howlite
Hydrous calcium borosilicate (Ca2B5SiO9(OH)5)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Caribbean Calcite
Calcium Carbonate with Aragonite (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Quartz Pebble (Water-worn)
Silicon Dioxide (SiO2)
mineral
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Travertine
Calcareous tufa (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral