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

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

Granite

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

Dyed Pink Quartzite (Jadeite Simulant) (Silicon Dioxide (SiO2) with organic dye) — metamorphic

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Chert Concretion (with typical hematite/limonite staining) (Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)) — sedimentary

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Shale (Argillite / Shaly Mudstone) — sedimentary

Shale

Argillite / Shaly Mudstone

Glauconite (Green Sandstone) (Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2) — sedimentary

Glauconite (Green Sandstone)

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Dyed Agate Geode Slice (Silicon Dioxide (SiO2) - Banded Chalcedony) — mineral

Dyed Agate Geode Slice

Silicon Dioxide (SiO2) - Banded Chalcedony

River Quartzite Siltstone (Quartz-rich Meta-siltstone (SiO2 dominated)) — metamorphic

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Asphalt aggregate (crushed stone in bitumen) (Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen) — sedimentary

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Dyed Agate Geode (Pink/Magenta) (Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz) — mineral

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Vesicular Basalt / Scoria (with Iron Oxide Alteration) (Vesicular Basalt) — igneous

Vesicular Basalt / Scoria (with Iron Oxide Alteration)

Vesicular Basalt

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Aquamarine (Beryl (Be3Al2Si6O18 with iron impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Milky Quartz Geode / Chalcedony Nodule (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz Geode / Chalcedony Nodule

Quartz (Silicon Dioxide - SiO2)

Smoky Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Bivalve Fossil (Shell-bearing Sedimentary Rock) (Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix) — fossil

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Hag Stone (Perforated Sedimentary Rock (typically Flint or Limestone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Flint or Limestone)

Granite (Phaneritic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)) — igneous

Granite

Phaneritic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)

Porphyritic Rhyolite (Porphyritic Rhyolite (Felsic volcanic rock)) — igneous

Porphyritic Rhyolite

Porphyritic Rhyolite (Felsic volcanic rock)

Sandstone (Weathered) (Arenite (typically SiO2 as quartz grains)) — sedimentary

Sandstone (Weathered)

Arenite (typically SiO2 as quartz grains)

Slate (Slate (Foliated Metamorphic Rock)) — metamorphic

Slate

Slate (Foliated Metamorphic Rock)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Granite (Weathered River Rock) (Granite (Phaneritic Igneous Rock)) — igneous

Granite (Weathered River Rock)

Granite (Phaneritic Igneous Rock)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Diamond (as set in a metal alloy ring) (Diamond (Pure Carbon, C)) — mineral

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Polished black agate slice (Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining) — mineral

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Hag Stone (Perforated Flint or Chert) — sedimentary

Hag Stone

Perforated Flint or Chert

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Sandstone (Arenite (compositionally various, primarily SiO2)) — sedimentary

Sandstone

Arenite (compositionally various, primarily SiO2)

Sandstone (likely Arkosic or Quartzose) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Bornite (“peacock ore”), likely weathered copper sulfide (Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish) — mineral

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Sandstone (Ferruginous) (Arenite (SiO2 with Fe-oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe-oxide cement)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Basalt (Vesicular/Waterworn) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (Vesicular/Waterworn)

Basalt (Mafic Extrusive Igneous Rock)

Halite (Rock Salt) (Halite (NaCl)) — mineral

Halite (Rock Salt)

Halite (NaCl)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Petoskey Stone (Hexagonaria percarinata) — sedimentary

Petoskey Stone

Hexagonaria percarinata

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Dyed Agate Geode (Slice) (Silicon Dioxide (SiO2) - Chalcedony / Quartz) — mineral

Blue Dyed Agate Geode (Slice)

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Dark volcanic sand / basaltic sand (Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass) — igneous

Dark volcanic sand / basaltic sand

Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass

Smoky Quartz (Vein Quartz) (Quartz (Silicon Dioxide, SiO2)) — mineral

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)