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

Limestone with possible fossil inclusions (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone with possible fossil inclusions

Sedimentary Calcium Carbonate (CaCO3)

Banded Calcite (often sold as Mexican Onyx) (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (often sold as Mexican Onyx)

Calcium Carbonate (CaCO3)

Pyrite (Iron Pyrite (FeS2)) — mineral

Pyrite

Iron Pyrite (FeS2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (CaCO3 (principally Calcite or Aragonite)) — sedimentary

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

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

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, 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

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

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Calcite (Calcite (CaCO3)) — Mineral

Calcite

Calcite (CaCO3)

Amber (Succinite (with various hydrocarbon compositions)) — mineral

Amber

Succinite (with various hydrocarbon compositions)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Native Sulfur (Sulfur (S)) — mineral

Native Sulfur

Sulfur (S)

Banded Calcite (Mexican Onyx) (Banded Calcite (CaCO3)) — sedimentary

Banded Calcite (Mexican Onyx)

Banded Calcite (CaCO3)

Chert (Green) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Green)

Silicon Dioxide (SiO2)

Quartzite with Chlorite and Iron Staining (Quartzite (SiO2) with Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2) — metamorphic

Quartzite with Chlorite and Iron Staining

Quartzite (SiO2) with Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2

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

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Limestone (with possible Manganese oxide inclusions) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with possible Manganese oxide inclusions)

Sedimentary Calcium Carbonate (CaCO3)

Yellow Quartzite (River Pebble) (Quartzite (SiO2 with iron oxide impurities)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide impurities)

White Marble (Recrystallized Carbonate Rock (CaCO3)) — metamorphic

White Marble

Recrystallized Carbonate Rock (CaCO3)

Limestone with Calcite Crystals (Sedimentary Rock containing Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Crystals

Sedimentary Rock containing Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chert / Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline Quartz (SiO2)

Limestone (specifically Bituminous or Carbonaceous Limestone) (Calcium Carbonate (CaCO3) with Organic Impurities) — sedimentary

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Banded Calcite / Fluorite (or Onyx/Agate depending on hardness) (CaCO3 or CaF2 (depending on exact ID)) — Mineral

Banded Calcite / Fluorite (or Onyx/Agate depending on hardness)

CaCO3 or CaF2 (depending on exact ID)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartz (Orthoquartzite) (Silicon Dioxide (SiO2)) — sedimentary

Quartz (Orthoquartzite)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))) — sedimentary

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

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

Quartzite (River Stone)

Quartzite (predominantly SiO2)

River Pebble (Basalt or Gabbro) (Mafic Igneous Rock) — igneous

River Pebble (Basalt or Gabbro)

Mafic Igneous Rock

Sandstone or Limestone (Sedimentary Rock) — Sedimentary

Sandstone or Limestone

Sedimentary Rock

Basalt (River Stone) (Basalt (SiO2 range 45-52%)) — igneous

Basalt (River Stone)

Basalt (SiO2 range 45-52%)

Quartzite Pebble (Quartzite (primarily Silicon Dioxide, SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chert with Calcite Veins (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions) — sedimentary

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Quartzite Pebble (Metamorphic Quartz (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartz (SiO2)

Pyrite Sun (Iron Sulfide (FeS2)) — mineral

Pyrite Sun

Iron Sulfide (FeS2)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Pyrite in Matrix (Iron Sulfide (FeS2)) — mineral

Pyrite in Matrix

Iron Sulfide (FeS2)