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

Opalite

Lead Feldspar

Dolomite

Zircon

Orange Calcite

Weathered limestone (Calcite-rich carbonate rock; primarily CaCO₃) — sedimentary

Weathered limestone

Calcite-rich carbonate rock; primarily CaCO₃

Limestone (with crushed gravel) (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Limestone (with crushed gravel)

Limestone (Calcium Carbonate, CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Marble (Sculptural Statue) (Metamorphic Limestone (CaCO3)) — metamorphic

Marble (Sculptural Statue)

Metamorphic Limestone (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Coquina) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Orange Calcite (Calcite (CaCO3)) — mineral

Orange Calcite

Calcite (CaCO3)

Fossiliferous Limestone (Bioclastic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

Quartz Pebble (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Amber (Amber (Fossilized Tree Resin)) — Mineral

Amber

Amber (Fossilized Tree Resin)

Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite (Intrusive igneous rock (Acidic)) — igneous

Granite

Intrusive igneous rock (Acidic)

Limestone Pebble (Sedimentary Rock (Calcite, CaCO3)) — sedimentary

Limestone Pebble

Sedimentary Rock (Calcite, CaCO3)

Tumbled Granite (Granite (composed of Quartz, Feldspar, and Mica)) — igneous

Tumbled Granite

Granite (composed of Quartz, Feldspar, and Mica)

Limestone Cobble (Sedimentary Limestone (CaCO3)) — sedimentary

Limestone Cobble

Sedimentary Limestone (CaCO3)

Calcite on Matrix (Calcium Carbonate (CaCO3)) — mineral

Calcite on Matrix

Calcium Carbonate (CaCO3)

Quartzite with Quartz Veining (Quartzite (primarily SiO2)) — metamorphic

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Likely basalt with a pale mineral-filled vesicle (Vesicular basalt, probably containing calcite or zeolite (uncertain from image)) — igneous

Likely basalt with a pale mineral-filled vesicle

Vesicular basalt, probably containing calcite or zeolite (uncertain from image)

Orange Calcite (or Yellow Calcite) (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite (or Yellow Calcite)

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Pink Granite (Granite (Phaneritic Acidic Igneous)) — igneous

Pink Granite

Granite (Phaneritic Acidic Igneous)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (River Pebble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Fossiliferous Limestone with Rugose Coral (Lithostrotionella (Limestone Matrix - CaCO3)) — sedimentary

Fossiliferous Limestone with Rugose Coral

Lithostrotionella (Limestone Matrix - CaCO3)

Limestone Gravel (Calcium Carbonate (CaCO3)) — sedimentary

Limestone Gravel

Calcium Carbonate (CaCO3)

Turquoise (Dyed Howlite or Magnesite imitation) (Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise (Dyed Howlite or Magnesite imitation)

Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O

Pitted Limestone with Honeycomb Weathering (Karst-weathered fossiliferous limestone (CaCO3)) — sedimentary

Pitted Limestone with Honeycomb Weathering

Karst-weathered fossiliferous limestone (CaCO3)

Peach Moonstone (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Turquoise (Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Limestone with Fossil Impression (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Fossil Impression

Calcium Carbonate (CaCO3)

Weathered quartz-rich stone, possibly chalcedony or calcite (Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing) — mineral

Weathered quartz-rich stone, possibly chalcedony or calcite

Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Limestone with Fossil Inclusion (Calcium Carbonate (CaCO3) - Bioclastic Limestone) — sedimentary

Limestone with Fossil Inclusion

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Moonstone (Orthoclase Feldspar (KAlSi3O8)) — Mineral

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartz-rich vein rock, possibly milky quartz in altered host rock (Quartz (SiO₂), likely with weathered silicate minerals and iron/manganese staining) — mineral

Quartz-rich vein rock, possibly milky quartz in altered host rock

Quartz (SiO₂), likely with weathered silicate minerals and iron/manganese staining

Limestone with Lichen/Algae (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Lichen/Algae

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Limestone (Calcium Carbonate, CaCO3)) — Sedimentary

Limestone

Limestone (Calcium Carbonate, CaCO3)