Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

sedimentary
Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

mineral
Granite fragment (Phaneritic Igneous Rock (Granitic composition)) — igneous

Granite fragment

Phaneritic Igneous Rock (Granitic composition)

igneous
Yellow Quartz (Chalcedony/Citrine Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Chalcedony/Citrine Pebble)

Silicon Dioxide (SiO2)

mineral
Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary
Quartz (Rose or Milky variety fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rose or Milky variety fragment)

Silicon Dioxide (SiO2)

mineral
Chert (variations include Flint or Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

sedimentary
Black Limestone with Calcite Veins (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Black Limestone with Calcite Veins

Limestone (Calcium Carbonate, CaCO3)

sedimentary
Quartz Geode (partially filled/solid) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode (partially filled/solid)

Silicon Dioxide (SiO2)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral
Chert (Jasper/Agate variety) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

sedimentary
Quartz with Orthoclase Feldspar (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Quartz with Orthoclase Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

mineral
Botryoidal Chalcedony (Silicon Dioxide (SiO2)) — Mineral

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Mineral
Chert (Common Opal or Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal or Chalcedony)

Microcrystalline Quartz (SiO2)

sedimentary
Fossiliferous Limestone (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

sedimentary
Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral
Chert (Jasper/Agate) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Agate)

Silicon Dioxide (SiO2)

sedimentary
Granite Pebble (Granite (Felsic Plutonic Rock)) — igneous

Granite Pebble

Granite (Felsic Plutonic Rock)

igneous
Granite River Pebble (Granite (composed of Quartz, Feldspar, and Biotite)) — igneous

Granite River Pebble

Granite (composed of Quartz, Feldspar, and Biotite)

igneous
Druzy Agate (Star-cut Geode Slice) (Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz) — mineral

Druzy Agate (Star-cut Geode Slice)

Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz

mineral
Riverstone Quartzite / Chalcedony Nugget (Silicon Dioxide (SiO2)) — metamorphic

Riverstone Quartzite / Chalcedony Nugget

Silicon Dioxide (SiO2)

metamorphic
Granitic Quartz or Pegmatite (Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)) — igneous

Granitic Quartz or Pegmatite

Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)

igneous
Silver (Native Silver) (Native Silver (Ag)) — mineral

Silver (Native Silver)

Native Silver (Ag)

mineral
Granite (River Pebble) (Phaneritic intrusive igneous rock (Felsic)) — igneous

Granite (River Pebble)

Phaneritic intrusive igneous rock (Felsic)

igneous
Riverstone (Quartzite or Siltstone cobble) (Quartzite (primarily SiO2)) — metamorphic

Riverstone (Quartzite or Siltstone cobble)

Quartzite (primarily SiO2)

metamorphic
Chert (Jasper/Flint variety) (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Jasper/Flint variety)

Silicon dioxide (SiO2) - Microcrystalline Quartz

sedimentary
Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

mineral
Graphic Granite (Graphic Granite (Granitic Pegmatite)) — igneous

Graphic Granite

Graphic Granite (Granitic Pegmatite)

igneous
Kunzite (Spodumene) (Spodumene (LiAlSi2O6)) — mineral

Kunzite (Spodumene)

Spodumene (LiAlSi2O6)

mineral
Picture Jasper (Silicified Mud or Siltstone (Silicon Dioxide, SiO2)) — sedimentary

Picture Jasper

Silicified Mud or Siltstone (Silicon Dioxide, SiO2)

sedimentary
Charoite (Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)) — metamorphic

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

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

Smoky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
Tiger's Eye (Silicon Dioxide with inclusions (SiO2)) — mineral

Tiger's Eye

Silicon Dioxide with inclusions (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Ocean Jasper (Spherulitic Chalcedony (SiO2)) — mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

mineral
Peach Moonstone (Orthoclase (KAlSi3O8)) — mineral

Peach Moonstone

Orthoclase (KAlSi3O8)

mineral
Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Garnet

Almandine (Fe3Al2(SiO4)3)

mineral
Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

mineral
Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basaltic Andesite) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basaltic Andesite

igneous
Limonite (Ironstone Concretion) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Ironstone Concretion)

Limonite (FeO(OH)·nH2O)

mineral