Rock Identifier

Category

Synthetic Material (Not A Rock Or Mineral)

Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.

Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Halite

Opalite

Lead Feldspar

Dolomite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Fossil Snail (Gastropoda fossil) — fossil

Fossil Snail

Gastropoda fossil

Basaltic Tuff / Volcanic Breccia (Pyroclastic Breccia / Lithic Tuff) — igneous

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Polished dark stone, possibly black tourmaline or a dark pebble (Undetermined; image lacks detail for reliable identification) — mineral

Polished dark stone, possibly black tourmaline or a dark pebble

Undetermined; image lacks detail for reliable identification

Gneiss (Foliated Metamorphic Rock (Gneiss)) — metamorphic

Gneiss

Foliated Metamorphic Rock (Gneiss)

Sandstone (with Concretion) (Arenite / Quartzose Sandstone) — sedimentary

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Banded metamorphic rock, likely gneiss or amphibolite (Composition uncertain; probable quartz–feldspar–amphibole assemblage) — metamorphic

Banded metamorphic rock, likely gneiss or amphibolite

Composition uncertain; probable quartz–feldspar–amphibole assemblage

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone (Arenite (Sedimentary Rock)) — sedimentary

Sandstone

Arenite (Sedimentary Rock)

Weathered gray stone, possibly basalt or granitic rock (Indeterminate fine- to medium-grained silicate rock; possible basalt, diabase, or weathered granite) — igneous

Weathered gray stone, possibly basalt or granitic rock

Indeterminate fine- to medium-grained silicate rock; possible basalt, diabase, or weathered granite

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Mixed rough mineral specimens, likely quartz-bearing rocks (Probable quartz (SiO₂), with possible feldspar, iron oxides, and altered host rock) — mineral

Mixed rough mineral specimens, likely quartz-bearing rocks

Probable quartz (SiO₂), with possible feldspar, iron oxides, and altered host rock

Granite-like rock (Felsic intrusive igneous rock, probably granitic or granodioritic) — igneous

Granite-like rock

Felsic intrusive igneous rock, probably granitic or granodioritic

Red Sandstone (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone (Quartzose) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (Sedimentary rock composed of sand-sized grains)) — sedimentary

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Blue-green copper mineral-bearing rock, likely chrysocolla with malachite (Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O) with malachite (Cu₂CO₃(OH)₂), possibly in altered host rock) — mineral

Blue-green copper mineral-bearing rock, likely chrysocolla with malachite

Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O) with malachite (Cu₂CO₃(OH)₂), possibly in altered host rock

Granite Cobble / Gneiss (River Rock) (Granitic Gneiss / Felsic Igneous Rock) — igneous

Granite Cobble / Gneiss (River Rock)

Granitic Gneiss / Felsic Igneous Rock

Tumbled quartz-rich pebble (Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing) — igneous

Tumbled quartz-rich pebble

Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing

Rough amethyst-bearing quartz specimens (Quartz, SiO₂; purple coloration from trace iron and irradiation) — mineral

Rough amethyst-bearing quartz specimens

Quartz, SiO₂; purple coloration from trace iron and irradiation

Sandstone (likely Siltstone or fine-grained Sandstone) (Sedimentary Rock (Clastic)) — sedimentary

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Rough Corundum (likely Sapphire or Common Corundum) (Aluminum oxide (Al2O3)) — mineral

Rough Corundum (likely Sapphire or Common Corundum)

Aluminum oxide (Al2O3)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with iron oxide Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide Fe2O3 cement)

Sandstone (Red) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Red)

Arenite (composed primarily of SiO2)

Sandstone (Sedimentary Rock (Quartz arenite / Lithic sandstone)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Small rounded pebble, possibly quartz-rich stone (Indeterminate; likely quartz/quartzite or a weathered feldspathic pebble) — igneous

Small rounded pebble, possibly quartz-rich stone

Indeterminate; likely quartz/quartzite or a weathered feldspathic pebble

Small weathered mineral/rock fragment (Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock) — mineral

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Limonite-stained quartz vein in host rock (Quartz (SiO₂) with iron-oxide/hydroxide staining, commonly goethite and limonite) — mineral

Limonite-stained quartz vein in host rock

Quartz (SiO₂) with iron-oxide/hydroxide staining, commonly goethite and limonite

Sandstone (Sandstone (Quartz-rich sedimentary rock)) — sedimentary

Sandstone

Sandstone (Quartz-rich sedimentary rock)

Possible fossilized shell or coral fragment (Indeterminate biogenic carbonate, likely calcite (CaCO₃)) — fossil

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Asphalt (Bituminous Rock) (Natural bitumen or Bituminous limestone/sandstone) — sedimentary

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Rock Fragment with Calcite/Quartz Vein (Polymictic Rock Fragment (SiO2 / CaCO3)) — igneous

Rock Fragment with Calcite/Quartz Vein

Polymictic Rock Fragment (SiO2 / CaCO3)

Weathered mica-rich schist (Muscovite–biotite schist, possibly quartz-bearing) — metamorphic

Weathered mica-rich schist

Muscovite–biotite schist, possibly quartz-bearing

Unidentified dark, flat specimen (Indeterminate; image resolution is insufficient for mineral identification) — mineral

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification

Sandstone (Sandstone (composed predominantly of Quartz, SiO2)) — sedimentary

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Red Agate (Carnelian) (Silicon Dioxide (SiO2)) — gemstone

Red Agate (Carnelian)

Silicon Dioxide (SiO2)

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)