Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (River Stone/Pebble) (Chert (SiO2)) — sedimentary

Chert (River Stone/Pebble)

Chert (SiO2)

Light-colored chert or weathered limestone (Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing) — sedimentary

Light-colored chert or weathered limestone

Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing

Tumbled quartz-rich rock, likely milky quartz with feldspar (Quartz (SiO₂), probably with feldspar and minor iron-oxide inclusions) — mineral

Tumbled quartz-rich rock, likely milky quartz with feldspar

Quartz (SiO₂), probably with feldspar and minor iron-oxide inclusions

Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

Sandstone Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in sedimentary host rock) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in sedimentary host rock

Rough Quartz (Clear Quartz) (Silicon Dioxide (SiO2)) — mineral

Rough Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained) (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Crystalline Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Gossan / Iron Ore Rock (Hematite / Goethite / Limonite iron oxide assemblage) — mineral

Gossan / Iron Ore Rock

Hematite / Goethite / Limonite iron oxide assemblage

Unakite (Altered Granite (composed of pink orthoclase feldspar, green epidote, and quartz)) — igneous

Unakite

Altered Granite (composed of pink orthoclase feldspar, green epidote, and quartz)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Chalcedony in Host Rock (Chalcedony (SiO2)) — mineral

Chalcedony in Host Rock

Chalcedony (SiO2)

Milky Quartz with Iron Inclusions (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Chert (and/or Flint) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Basalt (with Plagioclase Phenocrysts) (Porphyritic Basalt) — igneous

Basalt (with Plagioclase Phenocrysts)

Porphyritic Basalt

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Carnelian Agate (Silicon Dioxide (Chalcedony variety), SiO2) — gemstone

Carnelian Agate

Silicon Dioxide (Chalcedony variety), SiO2

Bumblebee Jasper (Fibrous Calcite and Quartz with Volcanic Matter (CaCO3 / SiO2)) — mineral

Bumblebee Jasper

Fibrous Calcite and Quartz with Volcanic Matter (CaCO3 / SiO2)

Chevron Amethyst (Silicon Dioxide (Quartz variety, SiO2)) — mineral

Chevron Amethyst

Silicon Dioxide (Quartz variety, SiO2)

Raw Sunstone (Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))) — mineral

Raw Sunstone

Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Granitic Pegmatite (Muscovite and Quartz) (Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)) — igneous

Granitic Pegmatite (Muscovite and Quartz)

Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)

Goldstone (N/A (Synthetic Glass with Copper Inclusions)) — Manufactured Glass

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Manufactured Glass

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily SiO2 with Fe2O3)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic glass containing Spherulites (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Brecciated Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Brecciated Jasper

Microcrystalline Quartz (SiO2)

Amazonite (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Amazonite

Potassium Aluminum Silicate (KAlSi3O8)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Quartz with Spessartine Garnet and Biotite (SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)) — mineral

Quartz with Spessartine Garnet and Biotite

SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Pyrite Cubes in Matrix (Iron Disulfide (FeS2) in Host Matrix) — mineral side rock

Pyrite Cubes in Matrix

Iron Disulfide (FeS2) in Host Matrix

mineral side rock

Granite Cobble (Granite (Phaneritic igneous rock)) — igneous

Granite Cobble

Granite (Phaneritic igneous rock)

Sandstone (Quartz-rich) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Quartz (Common or Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Granite (Phaneritic Plutonic Felsic Rock (SiO2 > 69%)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)