Rock Identifier

Category

Synthetic Polymer (Synthetic Material)

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

Learn about Synthetic Polymer (Synthetic Material) in the encyclopedia

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Opalite

Lead Feldspar

Peat

Zircon

Dunite

Limonite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Dark basalt or basaltic volcanic rock (Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine) — igneous

Dark basalt or basaltic volcanic rock

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Tumbled pegmatitic granite (Granite, chiefly quartz–feldspar–mica; likely altered pegmatite) — igneous

Tumbled pegmatitic granite

Granite, chiefly quartz–feldspar–mica; likely altered pegmatite

Tumbled sodalite (probable) (Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂) — mineral

Tumbled sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Orbicular jasper (likely ocean jasper) (Silica-rich microcrystalline quartz/chalcedony with feldspar and accessory minerals; composition varies) — mineral

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with feldspar and accessory minerals; composition varies

Fossil coral (likely solitary rugose coral) (Rugosa; possibly genus Heliophyllum or similar) — fossil

Fossil coral (likely solitary rugose coral)

Rugosa; possibly genus Heliophyllum or similar

Dark mafic rock, likely basalt (Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides) — igneous

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Iolite (Cordierite (Mg2Al3(AlSi5O18))) — gemstone

Iolite

Cordierite (Mg2Al3(AlSi5O18))

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone (Quartzose Sandstone (Sedimentary Rock)) — sedimentary

Sandstone

Quartzose Sandstone (Sedimentary Rock)

Green Quartzite (Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)) — metamorphic

Green Quartzite

Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)

Sandstone (Sedimentary Rock (Quartz arenite/Arkose)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Sandstone (Sedimentary Rock (Quartz Sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone (Quartz Arenite / Clastic Sedimentary Rock) — sedimentary

Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Sandstone (Quartz Arenite / Sedimentary Rock) — sedimentary

Sandstone

Quartz Arenite / Sedimentary Rock

K-Feldspar (Potassium Feldspar) (Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8) — mineral

K-Feldspar (Potassium Feldspar)

Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8

Septarian Nodule (Septarian Concretion (Calcite, Aragonite, Limestone)) — sedimentary

Septarian Nodule

Septarian Concretion (Calcite, Aragonite, Limestone)

Graphic Granite (Pegmatitic Granite) — igneous

Graphic Granite

Pegmatitic Granite

Green Fluorite with Galena (Calcium Fluoride (CaF2) with Lead Sulfide (PbS)) — mineral

Green Fluorite with Galena

Calcium Fluoride (CaF2) with Lead Sulfide (PbS)

Chalcedony Pebble / Rough Agate (Silicon Dioxide (SiO2)) — mineral

Chalcedony Pebble / Rough Agate

Silicon Dioxide (SiO2)

Quartz Pebble with Mineral Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble with Mineral Inclusions

Silicon Dioxide (SiO2)

Sandstone (Sandstone (SiO2 dominated)) — sedimentary

Sandstone

Sandstone (SiO2 dominated)

Sandstone (Arenite (primarily Quartz and Feldspar composition)) — sedimentary

Sandstone

Arenite (primarily Quartz and Feldspar composition)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Coquina or Fossiliferous Sandstone (Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)) — sedimentary

Coquina or Fossiliferous Sandstone

Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)

Siltstone (Siltstone (Detrital Sedimentary Rock)) — sedimentary

Siltstone

Siltstone (Detrital Sedimentary Rock)

Siltstone or Mudstone (Siltstone (composed primarily of silt-sized particles)) — sedimentary

Siltstone or Mudstone

Siltstone (composed primarily of silt-sized particles)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst (Amethyst (Silicon Dioxide, SiO2 + Fe4+)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe4+)

Red Sand / Ferruginous Sand (Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) impurities) — sedimentary

Red Sand / Ferruginous Sand

Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Sandstone (Arenite (SiO2 based with mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cements)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

River Stone (likely Quartzite or Limestone) (Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)) — metamorphic

River Stone (likely Quartzite or Limestone)

Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sandstone (with Calcite or Silica veins) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with Calcite or Silica veins)

Clastic sedimentary rock (primarily SiO2)

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

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Chert / Flint Pebble (Microcrystalline Silica (SiO2)) — sedimentary

Chert / Flint Pebble

Microcrystalline Silica (SiO2)

Gneissic Granite (Granite Gneiss) — metamorphic

Gneissic Granite

Granite Gneiss

Sandstone (Arenite (primarily Quartz-based)) — sedimentary

Sandstone

Arenite (primarily Quartz-based)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Chert (Flint) with Limestone Coating (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) cortex) — sedimentary

Chert (Flint) with Limestone Coating

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

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)