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

Moonstone (Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.) — mineral

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Weathered quartz-rich rock, possibly quartzite or quartz vein material (Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining) — metamorphic

Weathered quartz-rich rock, possibly quartzite or quartz vein material

Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Granite (Granite) — igneous

Granite

Granite

Chert (Common Opal or Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal or Agate)

Microcrystalline Quartz (SiO2)

Vesicular basalt (scoria-like lava rock) (Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and volcanic glass) — igneous

Vesicular basalt (scoria-like lava rock)

Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Sandstone (specifically Arkose or Ferruginous Sandstone) (Sandstone (SiO2 with iron oxide inclusions)) — sedimentary

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Aquamarine (Aquamarine (Beryl variety); Be3Al2Si6O18) — mineral

Aquamarine

Aquamarine (Beryl variety); Be3Al2Si6O18

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Serpentinite (Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)) — metamorphic

Serpentinite

Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)

Basalt (Basalt (Aphanitic Mafic Volcanic Rock)) — Igneous

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Porphyry (Porphyritic Rhyolite/Andesite) — igneous

Porphyry

Porphyritic Rhyolite/Andesite

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Granite (Dioritic variant) (Granite (Phaneritic Igneous Rock)) — igneous

Granite (Dioritic variant)

Granite (Phaneritic Igneous Rock)

Dark coarse-grained rock, likely basalt or gabbro (Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene) — igneous

Dark coarse-grained rock, likely basalt or gabbro

Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene

Ferruginous Breccia (Breccia with Iron-rich (Hematite/Goethite) Matrix) — sedimentary

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix

Chert (or potentially Jasper/Chalcedony) (SiO2 (Silicon Dioxide)) — sedimentary

Chert (or potentially Jasper/Chalcedony)

SiO2 (Silicon Dioxide)

Mica-rich schist (Muscovite–biotite schist, commonly quartz-bearing) — metamorphic

Mica-rich schist

Muscovite–biotite schist, commonly quartz-bearing

Basalt (Basalt (primarily Pyroxene and Plagioclase)) — igneous

Basalt

Basalt (primarily Pyroxene and Plagioclase)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Devil's Toenail (Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)) — sedimentary

Devil's Toenail

Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)

Black Beach Pebble (Basalt / Slate Pebble) (Rounded Fine-Grained Clastic / Igneous Rock Pebble) — sedimentary

Black Beach Pebble (Basalt / Slate Pebble)

Rounded Fine-Grained Clastic / Igneous Rock Pebble

Turquoise (Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Basalt (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Weathered dark rock fragment (Indeterminate; possibly basalt or iron-rich volcanic rock) — igneous

Weathered dark rock fragment

Indeterminate; possibly basalt or iron-rich volcanic rock

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

Granite

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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Tumbled dark igneous rock, likely basalt (Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine) — igneous

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Chert (potentially Flint or Mudstone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (potentially Flint or Mudstone)

Microcrystalline Quartz (SiO2)

Decomposed Granite (Grano-diorite/Granite-residuum (SiO2 primary)) — igneous

Decomposed Granite

Grano-diorite/Granite-residuum (SiO2 primary)

Granite Pebble (Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)) — igneous

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Gneiss (Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)) — metamorphic

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Weathered iron-rich sandstone or lateritic rock (Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite) — sedimentary

Weathered iron-rich sandstone or lateritic rock

Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Chert (specifically Gray Chert) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled cream-colored stone, likely quartzite or limestone (Probably quartzite (microcrystalline SiO₂); limestone alternative: calcite (CaCO₃)) — metamorphic

Tumbled cream-colored stone, likely quartzite or limestone

Probably quartzite (microcrystalline SiO₂); limestone alternative: calcite (CaCO₃)

Granite (Phaneritic intrusive igneous rock) — igneous

Granite

Phaneritic intrusive igneous rock

Chert (Tan/Grey variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Iron-rich quartzite or ferruginous metamorphic rock (Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)) — metamorphic

Iron-rich quartzite or ferruginous metamorphic rock

Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)