Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Epidote in Granite Gneiss (Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))) — metamorphic

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Weathered Quartzite or Chert Pebble (Silicon Dioxide (SiO2)) — metamorphic or sedimentary

Weathered Quartzite or Chert Pebble

Silicon Dioxide (SiO2)

metamorphic or sedimentary

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz Pebble (with possible Quartz Geode cavity) (Silicon Dioxide (SiO2)) — mineral

White Quartz Pebble (with possible Quartz Geode cavity)

Silicon Dioxide (SiO2)

Granitic Quartz with Feldspar (Granite (composed primarily of SiO2 and KAlSi3O8)) — igneous

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Quartz (Milky or Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining) (Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)) — sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Moss Agate (Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides

Ferruginous Quartz (Iron-stained Quartz (SiO2 with Fe2O3 impurities)) — mineral

Ferruginous Quartz

Iron-stained Quartz (SiO2 with Fe2O3 impurities)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Optical Calcite (Iceland Spar) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Amethyst (Chevron or Banded Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Fool's Gold) in Matrix (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Banded Calcite (Mexican Onyx) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Banded Calcite (Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Carnelian (Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)) — mineral

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Botryoidal Chalcedony (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Optical Calcite (Iceland Spar) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Quartz Geode (Silicon Dioxide (SiO2) within a geode) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Gold Ore in Matrix (Native Gold (Au) in Quartz/Host Rock) — mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Chalcedony (Common Opal or Agate variant) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Common Opal or Agate variant)

Silicon Dioxide (SiO₂)

Gold (in Opaque Matrix/Jewelry) (Native Gold (Au)) — mineral

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

Agate Geode / Thunderegg (Chalcedony (cryptocrystalline variety of Quartz), SiO2) — mineral

Agate Geode / Thunderegg

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Banded Agate (specifically Black Sardonyx/Onyx variety) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Banded Agate (specifically Black Sardonyx/Onyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Agate (Dyed) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (River Pebble) (Arenite (SiO2 based)) — sedimentary

Sandstone (River Pebble)

Arenite (SiO2 based)

Basalt (Weathered/River worn) (Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Quartz Geode (Silicon Dioxide (SiO2) in a Geode body) — sedimentary or igneous (host environment)

Quartz Geode

Silicon Dioxide (SiO2) in a Geode body

sedimentary or igneous (host environment)

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

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Sandstone (specifically Arkose or Quartz Arenite) (Arenite (primarily SiO2 with possible Feldspar)) — sedimentary

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Topaz (Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)) — mineral

Blue Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)

Sodalite (Na8(Al6Si6O24)Cl2 (Sodalite)) — mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodalite)

Chrysocolla on Quartz/Rhyolite matrix (Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Amethyst (Amethyst (variety of Quartz, SiO2)) — mineral

Amethyst

Amethyst (variety of Quartz, SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities