Rock Identifier

Category

Synthetic (Not A Natural Rock)

Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.

Learn about Synthetic (Not A Natural Rock) in the encyclopedia

Asphalt Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Chalk

Zircon

Obsidian

Kimberlite

Emerald in Matrix

Emerald in Matrix

Tripolite

Guano

Halite

Aquamarine Matrix

Aquamarine Matrix

Rock Salt

Small tumbled dark stone, possibly basalt or slag (Likely fine-grained basalt; exact identification is uncertain from the photograph) — igneous

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Granite (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite

Granite (Phaneritic intrusive igneous rock)

Yellow Quartz (Citrine/Yellow Jasper mix) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Moldavite (Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)) — meteorite

Moldavite

Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)

Red Sandstone (Siltstone pebble) (Arenite / Siltstone (Silicon dioxide based with hematite impurities)) — sedimentary

Red Sandstone (Siltstone pebble)

Arenite / Siltstone (Silicon dioxide based with hematite impurities)

Blue Sapphire Crystal (Rough) (Corundum (Aluminum Oxide, Al2O3)) — mineral

Blue Sapphire Crystal (Rough)

Corundum (Aluminum Oxide, Al2O3)

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Milky and Citrine-type Quartz (Silicon Dioxide (SiO2)) — mineral

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Green Aventurine (Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — metamorphic

Green Aventurine

Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Green Aventurine (Aventurine Quartz (SiO2 with inclusions of Fuchsite)) — mineral

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Tumbled jasper or chert (Microcrystalline quartz (SiO₂), possibly iron-bearing jasper) — mineral

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-bearing jasper

Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

Pink Granite (Granite (Phaneritic Felsic Igneous Rock)) — igneous

Pink Granite

Granite (Phaneritic Felsic Igneous Rock)

Granite (Phaneritic plutonic felsic igneous rock) — igneous

Granite

Phaneritic plutonic felsic igneous rock

Weathered iron-rich rock, possibly limonite-bearing sandstone (Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone) — mineral

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone

Tumbled orange chalcedony (likely carnelian) (Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian) — mineral

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Painted Garden Rock (likely Granite or Limestone base) (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments) — igneous or sedimentary (anthropogenic modification)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

igneous or sedimentary (anthropogenic modification)

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

Granite (Granite (Felsic intrusive igneous rock)) — igneous

Granite

Granite (Felsic intrusive igneous rock)

Granite (Phaneritic plutonic igneous rock (SiO2-rich)) — igneous

Granite

Phaneritic plutonic igneous rock (SiO2-rich)

Iron-rich laterite or limonite/goethite-bearing rock (Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O), likely in a lateritic matrix) — mineral

Iron-rich laterite or limonite/goethite-bearing rock

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O), likely in a lateritic matrix

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Shungite (Noble/Type II) (Non-crystalline carbon (Fullerene-bearing carbonaceous rock)) — metamorphic

Shungite (Noble/Type II)

Non-crystalline carbon (Fullerene-bearing carbonaceous rock)

Red jasper-like chalcedony pebble (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper) — mineral

Red jasper-like chalcedony pebble

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

Jasper Breccia (Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)) — sedimentary

Jasper Breccia

Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Dyed Blue Agate Slice (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Blue Agate Slice

Silicon Dioxide (SiO2) with artificial dye

Shale (Fissile Mudrock (Clay-rich Sedimentary Rock)) — sedimentary

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Shale (Mudstone/Shale) — sedimentary

Shale

Mudstone/Shale

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

Granite

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

Amethyst geode/druse (Quartz, SiO₂; purple variety amethyst) — mineral

Amethyst geode/druse

Quartz, SiO₂; purple variety amethyst

Granite (Felsic Plutonic Rock (Granite)) — igneous

Granite

Felsic Plutonic Rock (Granite)

Granite (Intrusive Felsic Igneous Rock) — igneous

Granite

Intrusive Felsic Igneous Rock

Tumbled jasper or brecciated jasper (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions) — mineral

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

Blue Sapphire (Raw) (Corundum (Al2O3)) — mineral

Blue Sapphire (Raw)

Corundum (Al2O3)

Red Jasper (Silicon Dioxide with iron impurities (Quartz variety, SiO2)) — sedimentary

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Shale or Mudstone (Based on appearance) (Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)) — Sedimentary

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Silty Shale or Mudstone (Siltstone/Mudstone (Clastic Sedimentary Rock)) — sedimentary

Silty Shale or Mudstone

Siltstone/Mudstone (Clastic Sedimentary Rock)

Likely foliated metamorphic rock, possibly schist (Mica schist or micaceous quartzite; exact identification is uncertain from the photograph) — metamorphic

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Pink Granite (Phaneritic intrusive igneous rock (Granite)) — igneous

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Hag Stone (Perforated Sedimentary Rock (typically Sandstone or Siltstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Sandstone or Siltstone)