Rock Identifier

Category

Organic (Biological Specimen)

Browse organic (biological specimen) specimens identified by the Rock Identifier community.

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Fossiliferous conglomerate (Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)) — sedimentary

Fossiliferous conglomerate

Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)

Likely fossilized bone or tooth fragment (Indeterminate fossil bone; mineral replacement commonly calcite, silica, or iron oxides) — fossil

Likely fossilized bone or tooth fragment

Indeterminate fossil bone; mineral replacement commonly calcite, silica, or iron oxides

Fossiliferous sandstone with plant fossils (Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image) — fossil

Fossiliferous sandstone with plant fossils

Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image

Pearl-bearing oyster shell (Nacreous shell, primarily aragonite (CaCO₃), with natural pearls (calcium-carbonate nacre)) — fossil

Pearl-bearing oyster shell

Nacreous shell, primarily aragonite (CaCO₃), with natural pearls (calcium-carbonate nacre)

Fossilized bone or tooth fragment (Indeterminate vertebrate fossil; likely permineralized bone, possibly a large mammal or marine vertebrate) — fossil

Fossilized bone or tooth fragment

Indeterminate vertebrate fossil; likely permineralized bone, possibly a large mammal or marine vertebrate

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Artifact) (Chert (SiO2)) — sedimentary

Chert (Arrowhead Artifact)

Chert (SiO2)

Fossilized coral or reef limestone (Calcite (CaCO₃), commonly fossil coral such as Scleractinia) — fossil

Fossilized coral or reef limestone

Calcite (CaCO₃), commonly fossil coral such as Scleractinia

Fossilized Shark Teeth (Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)) — sedimentary (fossilized organic matter)

Fossilized Shark Teeth

Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)

sedimentary (fossilized organic matter)

Fossil tooth, likely mammalian molar or premolar (Mineralized fossilized tooth; exact taxon cannot be determined from the image) — fossil

Fossil tooth, likely mammalian molar or premolar

Mineralized fossilized tooth; exact taxon cannot be determined from the image

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variant)

Microcrystalline Quartz (SiO2)

Fossilized shell or bone fragment (Indeterminate biogenic calcite or apatite fossil) — fossil

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Limestone with Chert Nodule (Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion) — sedimentary

Limestone with Chert Nodule

Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion

Amber (Succinite (fossilized tree resin), C10H16O) — Organic Gemstone

Amber

Succinite (fossilized tree resin), C10H16O

Organic Gemstone

Fossil scallop shell (Bivalve mollusk shell, likely family Pectinidae; primarily calcite (CaCO₃)) — fossil

Fossil scallop shell

Bivalve mollusk shell, likely family Pectinidae; primarily calcite (CaCO₃)

Chert (Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Fossiliferous limestone (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur). (Galena (PbS)) — mineral

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Weathered limestone slab (Micritic limestone, primarily calcite (CaCO₃)) — sedimentary

Weathered limestone slab

Micritic limestone, primarily calcite (CaCO₃)

Gastropod Steinkern (Internal Mold Fossil) (Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix) — sedimentary

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Chert (containing Fossil Mold) (Silicon dioxide (SiO2)) — sedimentary

Chert (containing Fossil Mold)

Silicon dioxide (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Limestone with Fossil Fragments (Bioclastic Carbonate Rock (CaCO3)) — sedimentary

Limestone with Fossil Fragments

Bioclastic Carbonate Rock (CaCO3)

Black Limestone with Calcite Veins (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Black Limestone with Calcite Veins

Limestone (Calcium Carbonate, CaCO3)

Chert (River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Quartz pebble or seed/crumb (SiO2 (if quartz)) — mineral

Quartz pebble or seed/crumb

SiO2 (if quartz)

Chert (with Quartz Druzy) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (with Quartz Druzy)

Microcrystalline Silica (SiO2)

Chert (Jasper influence) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Fossiliferous limestone, likely with a coral or stromatoporoid fossil (Calcite (CaCO₃) limestone containing fossilized marine skeletal material) — fossil

Fossiliferous limestone, likely with a coral or stromatoporoid fossil

Calcite (CaCO₃) limestone containing fossilized marine skeletal material

Shungite (Carbonaceous rock (primarily amorphous carbon)) — Mineraloid

Shungite

Carbonaceous rock (primarily amorphous carbon)

Seashell (Calcium Carbonate) (Calcium Carbonate (CaCO3)) — mineral

Seashell (Calcium Carbonate)

Calcium Carbonate (CaCO3)

Fossilized coral or bryozoan limestone (Calcitic fossiliferous limestone; likely colonial coral/bryozoan fragments, CaCO₃) — fossil

Fossilized coral or bryozoan limestone

Calcitic fossiliferous limestone; likely colonial coral/bryozoan fragments, CaCO₃

Fossilized Echinoid (Echinoidea (likely of the order Echinoidea)) — fossil

Fossilized Echinoid

Echinoidea (likely of the order Echinoidea)

Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — Organic Gemstone (Sedimentary classification)

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Organic Gemstone (Sedimentary classification)

Banded chert (likely jasper/chalcedony-rich stone) (Microcrystalline quartz, SiO₂, with iron-oxide impurities) — sedimentary

Banded chert (likely jasper/chalcedony-rich stone)

Microcrystalline quartz, SiO₂, with iron-oxide impurities

Chert (Pink Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Pink Jasper)

Microcrystalline Quartz (SiO2)

Pumice (Highly vesicular volcanic rock, commonly rhyolitic to dacitic glass (SiO₂-rich volcanic material)) — igneous

Pumice

Highly vesicular volcanic rock, commonly rhyolitic to dacitic glass (SiO₂-rich volcanic material)

Chert (Iron-stained) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities