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

Flagstone paving (likely sandstone or limestone) (Clastic sandstone or carbonate limestone; exact identification requires testing) — sedimentary

Flagstone paving (likely sandstone or limestone)

Clastic sandstone or carbonate limestone; exact identification requires testing

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Chert (Nodule) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Pyrite in Quartz (Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)) — mineral

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Milky Quartz (Water-worn Pebble) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Quartzite Geode (unopened) (SiO2 (Silicon Dioxide)) — metamorphic

Quartzite Geode (unopened)

SiO2 (Silicon Dioxide)

Ruby (Faceted) (Corundum (Al2O3 with Cr trace elements)) — gemstone

Ruby (Faceted)

Corundum (Al2O3 with Cr trace elements)

Polished agate or jasper cabochon (Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions) — gemstone

Polished agate or jasper cabochon

Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions

Concrete / Conglomerate (Man-made) (Artificial Conglomerate (Cementitious Composite)) — sedimentary

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Nut-stone / Cup-stone artifact) (Quartz Arenite / Worked Sedimentary Rock) — sedimentary

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Vesicular basalt (weathered scoriaceous basalt) (Basalt; chiefly plagioclase, pyroxene, and commonly olivine (approximately 45–52% SiO₂)) — igneous

Vesicular basalt (weathered scoriaceous basalt)

Basalt; chiefly plagioclase, pyroxene, and commonly olivine (approximately 45–52% SiO₂)

Greenstone (Metamorphic mafic rock (greenschist facies)) — metamorphic

Greenstone

Metamorphic mafic rock (greenschist facies)

Uncertain polymict breccia or altered volcanic rock (Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing) — igneous

Uncertain polymict breccia or altered volcanic rock

Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing

Red Sandstone with Reduction Spot (Quartzose Sandstone with a Leach/Reduction Spot) — sedimentary

Red Sandstone with Reduction Spot

Quartzose Sandstone with a Leach/Reduction Spot

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

Quartz Geode (Crystalline Silicon Dioxide (SiO2) in a Geode) — mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geode

Tumbled brown chalcedony or jasper (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper) — mineral

Tumbled brown chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Likely serpentinized ultramafic rock (serpentinite) (Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite) — metamorphic

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite

Pebble or Cobble (likely composed of sandstone or conglomerate) (Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)) — Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

Pebble or Cobble (likely composed of sandstone or conglomerate)

Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)

Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

Chert Nodule (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Flint)

Microcrystalline Quartz (SiO2)

Weathered quartz-bearing rock, possibly sandstone or quartzite (Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone) — metamorphic

Weathered quartz-bearing rock, possibly sandstone or quartzite

Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone

Petrified Wood (Silicified wood (Quartz/Chalcedony - SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Red Sandstone (Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)) — sedimentary

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Nodule) (Microcrystalline or Cryptocrystalline Silica (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)

Garnet-bearing metamorphic rock, likely mica schist (Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet) — metamorphic

Garnet-bearing metamorphic rock, likely mica schist

Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet

Rounded gray-brown river pebble (Indeterminate lithic clast; likely weathered sandstone or fine-grained metamorphic rock) — sedimentary

Rounded gray-brown river pebble

Indeterminate lithic clast; likely weathered sandstone or fine-grained metamorphic rock

Basalt (Basalt (extrusive igneous rock)) — Igneous

Basalt

Basalt (extrusive igneous rock)

Slate (Slate (Foliated Metamorphic Rock)) — metamorphic

Slate

Slate (Foliated Metamorphic Rock)

Granite (Granite (Phaneritic Quartz-Feldspar rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Petrified Wood (Silicified Wood (SiO2 - Silicon Dioxide)) — mineral

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Quartzite (Quartz-rich metamorphic rock; chiefly SiO₂) — metamorphic

Quartzite

Quartz-rich metamorphic rock; chiefly SiO₂

Polished red jasper (Jasper, microcrystalline quartz (SiO₂) colored by iron oxides) — mineral

Polished red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Porphyritic Rhyolite (Llanite or similar) (Porphyritic Rhyolite / Quartz-Feldspar Porphyry) — igneous

Porphyritic Rhyolite (Llanite or similar)

Porphyritic Rhyolite / Quartz-Feldspar Porphyry

Unakite (Epidote–orthoclase–quartz metamorphic rock) — metamorphic

Unakite

Epidote–orthoclase–quartz metamorphic rock

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Gneiss (Banded Gneiss) (Gneiss) — metamorphic

Gneiss (Banded Gneiss)

Gneiss

Tumbled serpentine (Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4) — metamorphic

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

Diamond (Faceted) (Diamond (Pure Carbon, C)) — gemstone

Diamond (Faceted)

Diamond (Pure Carbon, C)

Polished/patinated jasper slab (Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions) — sedimentary

Polished/patinated jasper slab

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions

Granite (Granite (felsic intrusive igneous rock)) — igneous

Granite

Granite (felsic intrusive igneous rock)