Fossilized Coral
Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)
sedimentary
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Azurite in Gossan
Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix
mineral
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
White Marble (Tumbled)
Recrystallized Calcite (CaCO3)
metamorphic
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Orange Calcite (Dogtooth/Cluster)
Calcium Carbonate (CaCO3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite in Matrix (Commonly called Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Fluorite (Green)
Calcium Fluoride (CaF2)
mineral
Pyrite (on Quartz/Sulfide matrix)
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite (Rainbow or Multi-colored Fluorite)
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartzite Pebble
Meta-quartzite
metamorphic
Basalt Pebble
Basalt
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral