Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

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

Quartz (River Stone)

Silicon Dioxide (SiO2)

Gneiss with Quartz Vein (Gneiss (containing SiO2 vein)) — metamorphic

Gneiss with Quartz Vein

Gneiss (containing SiO2 vein)

Satin Spar (often marketed as Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (often marketed as Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Rose Quartz (SiO2 (Silicon Dioxide)) — mineral

Rose Quartz

SiO2 (Silicon Dioxide)

Quartz (Sea Glass or River-worn Pebble style) (Silicon Dioxide (SiO2)) — mineral

Quartz (Sea Glass or River-worn Pebble style)

Silicon Dioxide (SiO2)

Limonite Concretion (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Granite Cobble (Phaneritic Felsic Igneous Rock) — igneous

Granite Cobble

Phaneritic Felsic Igneous Rock

Agate (Agate (Cryptocrystalline Quartz, SiO2)) — Mineral

Agate

Agate (Cryptocrystalline Quartz, SiO2)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Fluorite Tower (Fluorite (Calcium Fluoride - CaF2)) — mineral

Fluorite Tower

Fluorite (Calcium Fluoride - CaF2)

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

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Diamond (Native Carbon (C)) — mineral

Diamond

Native Carbon (C)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite) (Calcite) — Mineral

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Dyed Pink Agate (or Dyed Quartzite) (Silicon dioxide (SiO2) with artificial pigment) — sedimentary

Dyed Pink Agate (or Dyed Quartzite)

Silicon dioxide (SiO2) with artificial pigment

Silicified Gastropod Fossil (Agatized Fossil) (Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)) — sedimentary

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Chert (Jasper/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Hematite or Goethite-rich Ironstone (Ironstone (Oxidized Iron Ore)) — sedimentary

Hematite or Goethite-rich Ironstone

Ironstone (Oxidized Iron Ore)

Sandstone (with Chert/Quartzite) (Arenite (SiO2 primarily)) — sedimentary

Sandstone (with Chert/Quartzite)

Arenite (SiO2 primarily)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Banded Chert / Jasper (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Iron Ore (Hematite/Goethite) (Ironstone (Fe2O3 / FeO(OH))) — sedimentary

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

Chert with Limestone Cortex (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)) — sedimentary

Chert with Limestone Cortex

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Calcium carbonate (CaCO3) with marine fossils) — sedimentary

Fossiliferous Limestone

Calcium carbonate (CaCO3) with marine fossils

Zebra Stone (Silicified Siltstone) (Silicified Siltstone with Quartz/Kaolinite inclusions) — sedimentary

Zebra Stone (Silicified Siltstone)

Silicified Siltstone with Quartz/Kaolinite inclusions

Andesite Porphyry (Geological Drill Core) (Andesite Porphyry) — igneous

Andesite Porphyry (Geological Drill Core)

Andesite Porphyry

Chert (Jasper-like Silicate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper-like Silicate)

Microcrystalline Quartz (SiO2)

Sandstone (Micaceous) (Clastic Sedimentary Rock (primarily SiO2 with Mica)) — sedimentary

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Amethyst or Smoky Quartz Geode Slice (Crystalline Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst or Smoky Quartz Geode Slice

Crystalline Silicon Dioxide (SiO2) with iron impurities

Sandstone (Ferruginous) (Arenite (Fe-rich)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Cryptocrystalline Quartz (Agate/Chert) (Silicon dioxide (SiO2)) — sedimentary

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Quartz Geode (partially formed) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

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

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Granite (Granite) — igneous

Granite

Granite

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

Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite with Iron Oxide cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Hand-Drawn Trading Card (Amateur Artwork) (Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)) — Organic/Synthetic Composite (Paper and Pigment)

Hand-Drawn Trading Card (Amateur Artwork)

Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)

Organic/Synthetic Composite (Paper and Pigment)

Flower Jasper (Agatized Fossil Coral / Chalcedony (SiO2)) — sedimentary

Flower Jasper

Agatized Fossil Coral / Chalcedony (SiO2)

Quartzite (Metamorphosed Quartz Sandstone) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone