Rock Identifier

Category

Synthetic Polymer (Polylactic Acid)

Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.

Learn about Synthetic Polymer (Polylactic Acid) in the encyclopedia

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Zincite

Opalite

Opalite

Lead Feldspar

Lead Feldspar

Dolomite

Dolomite

Orange Calcite

Orange Calcite

Zircon

Zircon

Travertine (Tufa) (Chemical Sedimentary Rock / Travertine (CaCO3)) — sedimentary

Travertine (Tufa)

Chemical Sedimentary Rock / Travertine (CaCO3)

Azurite with Malachite and Limonite (Azurite Cu3(CO3)2(OH)2 / Malachite Cu2CO3(OH)2) — mineral

Azurite with Malachite and Limonite

Azurite Cu3(CO3)2(OH)2 / Malachite Cu2CO3(OH)2

Limestone with fossil crinoid stems (Calcium Carbonate (CaCO3) containing Crinoidea fossils) — sedimentary

Limestone with fossil crinoid stems

Calcium Carbonate (CaCO3) containing Crinoidea fossils

Limestone with Calcite Veins (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Limestone (River Pebble) (Calcite-rich Sedimentary Rock (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcite-rich Sedimentary Rock (CaCO3)

Fossiliferous Limestone (with Crinoids/Coral) (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone (with Crinoids/Coral)

Fossiliferous Limestone (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Calcite (Banded Calcite / Onyx Marble) (Calcium Carbonate (CaCO3)) — mineral

Calcite (Banded Calcite / Onyx Marble)

Calcium Carbonate (CaCO3)

Honey Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Calcite (often sold as 'Green Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Basalt with Calcite Veins (Basalt (Mafic Volcanic Rock)) — igneous

Basalt with Calcite Veins

Basalt (Mafic Volcanic Rock)

Fossiliferous Limestone (Limestone (CaCO3) with Crinoid/Bivalve fossils) — sedimentary

Fossiliferous Limestone

Limestone (CaCO3) with Crinoid/Bivalve fossils

Glacial Cobble (likely Granitic or Gneissic) (Granite/Gneiss Glacial Erratic) — igneous

Glacial Cobble (likely Granitic or Gneissic)

Granite/Gneiss Glacial Erratic

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Red Quartzite (likely Purple/Red variety) (Quartzite (SiO2)) — metamorphic

Red Quartzite (likely Purple/Red variety)

Quartzite (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite (with possible Iron staining) (Meta-orthoquartzite (primarily SiO2)) — metamorphic

Quartzite (with possible Iron staining)

Meta-orthoquartzite (primarily SiO2)

Banded Calcite (often sold as 'Mexican Onyx') (Calcite (Calcium Carbonate, CaCO3)) — Mineral / Sedimentary Rock

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Mineral / Sedimentary Rock

Quartzite (Quartzite (principally SiO2)) — metamorphic

Quartzite

Quartzite (principally SiO2)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

Orange Calcite (Calcite (CaCO3)) — Mineral

Orange Calcite

Calcite (CaCO3)

Quartzite River Rock (Metaquartzite (majorly SiO2)) — metamorphic

Quartzite River Rock

Metaquartzite (majorly SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Marble (Sculculpted) (Metamorphosed Limestone (primarily CaCO3)) — metamorphic

Marble (Sculculpted)

Metamorphosed Limestone (primarily CaCO3)

Pink Quartzite (Quartzite (SiO2) with inclusions) — metamorphic

Pink Quartzite

Quartzite (SiO2) with inclusions

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Basalt with Calcite Veining (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with CaCO3 veins) — igneous

Basalt with Calcite Veining

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with CaCO3 veins

Coquina (Coquina (Limestone variant)) — sedimentary

Coquina

Coquina (Limestone variant)

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Basalt with Calcite Veining (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Calcite Veining

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Fossiliferous Limestone (Coquina) (Calcite (CaCO3) with Bioclastic inclusions) — sedimentary

Fossiliferous Limestone (Coquina)

Calcite (CaCO3) with Bioclastic inclusions

Coquina / Shell Limestone (Coquina (Bioclastic Limestone)) — sedimentary

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Quartz / Quartzite (Silicon Dioxide (SiO2)) — Mineral / Metamorphic

Quartz / Quartzite

Silicon Dioxide (SiO2)

Mineral / Metamorphic

Coquina or Fossilized Shell Fragment (Calcium Carbonate (CaCO3) / Biogenic Limestone) — sedimentary

Coquina or Fossilized Shell Fragment

Calcium Carbonate (CaCO3) / Biogenic Limestone

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Optical Calcite (Iceland Spar) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)