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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Coquina or Fossiliferous Limestone (Fossiliferous Calcarenite (CaCO3)) — sedimentary

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Fossiliferous Limestone (Crinoidal Limestone) (Calcium Carbonate with Crinoid Stem Fossils (CaCO3)) — sedimentary

Fossiliferous Limestone (Crinoidal Limestone)

Calcium Carbonate with Crinoid Stem Fossils (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Marble (Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)) — metamorphic

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Celestine (or Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (or Celestite)

Strontium sulfate (SrSO4)

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

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Tufa (Vesicular Limestone) (Tufa (form of Calcium Carbonate, CaCO3)) — sedimentary

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Sandstone (River Pebble) (Arenite (SiO2 based)) — sedimentary

Sandstone (River Pebble)

Arenite (SiO2 based)

White Marble (Industrial/Architectural) (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble (Industrial/Architectural)

Recrystallized Calcite (CaCO3)

Quartzite Cobble (Meta-quartzite (SiO2)) — metamorphic

Quartzite Cobble

Meta-quartzite (SiO2)

Green Quartz (Prasiolite variant or Aventurine) (Silicon Dioxide (SiO2)) — mineral

Green Quartz (Prasiolite variant or Aventurine)

Silicon Dioxide (SiO2)

Fossiliferous Limestone with Crinoid Stem fragment (Calcite (CaCO3) containing Crinoidea fossils) — sedimentary

Fossiliferous Limestone with Crinoid Stem fragment

Calcite (CaCO3) containing Crinoidea fossils

Marble (Metamorphosed Limestone (calcite formulation CaCO3)) — metamorphic

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Limestone with Iron Inclusions (Calcium Carbonate (CaCO3) with Hematite/Limonite) — sedimentary

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartzite with Quartz Geode / Vug (Crystalline Silicon Dioxide (SiO2) in Metamorphic Host) — metamorphic

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Rhodonite with Manganese Oxides (Rhodonite (Mn,Fe,Mg,Ca)SiO3) — metamorphic

Rhodonite with Manganese Oxides

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Sandstone (likely Arkosic or Lithic) (Clastic Sedimentary Rock (SiO2 with accessory minerals)) — sedimentary

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Basalt with Quartz/Calcite Vein (Amygdaloidal Basalt (matrix) with Mineral Vein filling) — igneous

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Quartzite (Milky Quartz Cobble) (Silicon Dioxide (SiO2)) — Metamorphic

Quartzite (Milky Quartz Cobble)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Azurite and Malachite (Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)) — mineral

Azurite and Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)

Pink Banded Onyx (Mexican Onyx / Calcite) (Calcite (CaCO3) - microcrystalline calcium carbonate) — sedimentary

Pink Banded Onyx (Mexican Onyx / Calcite)

Calcite (CaCO3) - microcrystalline calcium carbonate

Quartzite (Metamorphosed Quartz Arenite (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Arenite (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartzite river pebble (Quartzite (SiO2)) — metamorphic

Quartzite river pebble

Quartzite (SiO2)

Fossiliferous Limestone (Coquina / Shell Conglomerate) (Bioclastic Limestone (composed primarily of CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Conglomerate)

Bioclastic Limestone (composed primarily of CaCO3)

Columnar Calcite / Satin Spar (Calcite (Calcium Carbonate, CaCO3)) — mineral

Columnar Calcite / Satin Spar

Calcite (Calcium Carbonate, CaCO3)

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

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)