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

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Marble (Metamorphosed Limestone (main mineral: Calcite, CaCO3)) — metamorphic

Marble

Metamorphosed Limestone (main mineral: Calcite, CaCO3)

Quartzite Pebbler (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebbler

Quartzite (primarily SiO2)

Caliche (with Lichen Cover) (Calcium carbonate-cemented soil layer (CaCO3)) — sedimentary

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Rhyolite (Rhyolite (Extrusive Igneous Rock)) — igneous

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Fossiliferous Limestone (Fossiliferous Limestone) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone

Marble (Recrystallized Calcite Rock (CaCO3)) — metamorphic

Marble

Recrystallized Calcite Rock (CaCO3)

Tufa (Limestone) (Calcareous Tufa (CaCO3)) — sedimentary

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Microcrystalline Limestone Pebble (Carbonate sedimentary rock (Calcium Carbonate, CaCO3)) — sedimentary

Microcrystalline Limestone Pebble

Carbonate sedimentary rock (Calcium Carbonate, CaCO3)

Limestone Pebble (Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Crinoid stem) (CaCO3 (Calcium Carbonate) with Fossil Inclusions) — sedimentary

Fossiliferous Limestone (Crinoid stem)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Rhodonite (Manganese silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Rhodonite ((Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

Black Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Black Marble

Recrystallized Calcite (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

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

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Travertine (Tufa) (Terrestrial Sedimentary Limestone (CaCO3)) — sedimentary

Travertine (Tufa)

Terrestrial Sedimentary Limestone (CaCO3)

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

Banded Calcite (often commercially sold as Mexican Onyx or Green Onyx)

Calcium Carbonate (CaCO3)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

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

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Malachite (Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)) — mineral

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Unakite (or Epidotized Granite) (Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)) — metamorphic

Unakite (or Epidotized Granite)

Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)

Aura Quartz (Titanium-coated Silicon Dioxide (SiO2)) — mineral

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Banded Calcite (Mexican Onyx) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Banded Calcite (Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Aragonite (Botryoidal/Coralloidal variety) (Aragonite (CaCO3)) — mineral

Aragonite (Botryoidal/Coralloidal variety)

Aragonite (CaCO3)

Banded Calcite (variety Honey Calcite / Chocolate Calcite) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (variety Honey Calcite / Chocolate Calcite)

Calcium Carbonate (CaCO3)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

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

Fluorite (Green Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Basalt (Basalt (containing Pyroxene, Plagioclase Feldspar, and Olivine)) — igneous

Basalt

Basalt (containing Pyroxene, Plagioclase Feldspar, and Olivine)

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

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Fluorite Tower (Fluorite (Calcium Fluoride - CaF2)) — mineral

Fluorite Tower

Fluorite (Calcium Fluoride - CaF2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Rainbow Fluorite (Calcium Fluoride (CaF2)) — mineral

Rainbow Fluorite

Calcium Fluoride (CaF2)