Rock Identifier

Category

Organic Mineraloid

Browse organic mineraloid specimens identified by the Rock Identifier community.

Sandstone (Quartzose Sandstone) (Arenite (primarily SiO2 with minor Fe2O3)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Granite (Alkali-feldspar Granite) (Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)) — igneous

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Granite (with Orthoclase and Quartz) (Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)) — igneous

Granite (with Orthoclase and Quartz)

Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)

Gneiss (specifically a granitic gneiss cobble) (Gneiss (high-grade regional metamorphic rock)) — metamorphic

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Iron Slag (Iron smelting byproduct (Glassy/vesicular silicate)) — anthropogenic / industrial byproduct

Iron Slag

Iron smelting byproduct (Glassy/vesicular silicate)

anthropogenic / industrial byproduct

Pegmatite (Granitic) (Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)) — igneous

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and Biotite)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Granite (Fine-grained) (Phaneritic Felsic Igneous Rock) — igneous

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Granite (Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granite (Felsic Intrusive Igneous Rock) — igneous

Granite

Felsic Intrusive Igneous Rock

Granite (Dioritic or Hornblende-rich) (Phaneritic Plutonic Felsic to Intermediate Igneous Rock) — igneous

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Greenschist (Greenschist facies rock (containing chlorite, actinolite, and epidote)) — metamorphic

Greenschist

Greenschist facies rock (containing chlorite, actinolite, and epidote)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Granite (Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite (Granite (Alkali-feldspar, Quartz, and Plagioclase composition)) — igneous

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

Granite (Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)) — igneous

Granite

Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with Bioclastic inclusions) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic inclusions

Soapstone (Steatite (primarily Talc, Mg3Si4O10(OH)2)) — metamorphic

Soapstone

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Mica Schist with Iron Staining (Mica Schist) — metamorphic

Mica Schist with Iron Staining

Mica Schist

Red Granite (Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)) — igneous

Red Granite

Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)

Red Granite (Phaneritic Plutonic Rock (High Potassium Feldspar)) — igneous

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Granite (Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Gneiss (High-grade Metamorphic Gneiss) — metamorphic

Gneiss

High-grade Metamorphic Gneiss

Diorite (Porphyritic) (Porphyritic Diorite) — igneous

Diorite (Porphyritic)

Porphyritic Diorite

Granite (Granite) — igneous

Granite

Granite

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4

Granite (Granite (Phaneritic igneous rock)) — igneous

Granite

Granite (Phaneritic igneous rock)

Granite (Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)

Gneiss (Gneiss (a type of metamorphic rock)) — Metamorphic Rock

Gneiss

Gneiss (a type of metamorphic rock)

Metamorphic Rock

Drill Core Sample (Cylindrical Rock Core (Specific mineralogy varies by extraction site)) — Metamorphic (Likely Gneiss or Schist based on texture)

Drill Core Sample

Cylindrical Rock Core (Specific mineralogy varies by extraction site)

Metamorphic (Likely Gneiss or Schist based on texture)

Granite (Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Eclogite (Eclogite (Omphacite-Garnet rock)) — metamorphic

Eclogite

Eclogite (Omphacite-Garnet rock)

Sandstone (with potential trace fossils) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Pyrite Sun (Pyrite Dollar) (Iron Disulfide (FeS2)) — mineral

Pyrite Sun (Pyrite Dollar)

Iron Disulfide (FeS2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)