Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Learn about Mineral Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Morganite Crystal

Morganite Crystal

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

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

Quartz (Milky/Yellowish)

Silicon Dioxide (SiO2)

Amethyst Geode (Silicon Dioxide with trace inclusions of Iron (SiO2)) — mineral

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Quartz (with iron oxide staining) (Silicon Dioxide (SiO2)) — mineral

Quartz (with iron oxide staining)

Silicon Dioxide (SiO2)

Optical Calcite (Calcium Carbonate (CaCO3)) — mineral

Optical Calcite

Calcium Carbonate (CaCO3)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — mineral

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Fluorite (Green) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Green)

Calcium Fluoride (CaF2)

Botryoidal Chalcedony (likely Chert or Agatized Coral) (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony (likely Chert or Agatized Coral)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Brown Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Brown Agate

Cryptocrystalline Quartz (SiO2)

Pink Granite (Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)) — igneous

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Carnelian (Flame Polished) (Carnelian (SiO2 with Iron Oxide impurities)) — mineral

Carnelian (Flame Polished)

Carnelian (SiO2 with Iron Oxide impurities)

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Quartz (Milky/Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Tumbled red jasper (Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions) — mineral

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Copper Ore (Cupriferous Rock / Mixed Mineral Matrix) — igneous

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Gneiss (specifically Epidote-Quartz Gneiss) (Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)) — metamorphic

Gneiss (specifically Epidote-Quartz Gneiss)

Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)

Tiger's Eye (often misinterpreted as Gold Ore in this context) (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye (often misinterpreted as Gold Ore in this context)

Pseudomorph of Quartz after Crocidolite (SiO2)

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

Chert (Jasper variety)

Silicon dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Larvikite cabochon (Larvikite, a feldspar-rich monzonitic intrusive rock; commonly containing blue labradorescent alkali feldspar, nepheline, and dark pyroxene/biotite) — igneous

Larvikite cabochon

Larvikite, a feldspar-rich monzonitic intrusive rock; commonly containing blue labradorescent alkali feldspar, nepheline, and dark pyroxene/biotite

Likely weathered granite or granitic fragment (Granite; chiefly quartz (SiO₂), feldspar, and mica) — igneous

Likely weathered granite or granitic fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica

Auriferous Quartz (Gold-bearing Quartz) (Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides) — mineral

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Almandine Garnet in Matrix (Almandine Garnet (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3)

Septarian (Dragon Stone) (Septarian concretion (Calcite, Aragonite, and Limestone)) — sedimentary

Septarian (Dragon Stone)

Septarian concretion (Calcite, Aragonite, and Limestone)

Amethyst with Quartz Vein (SiO2 (Silicon Dioxide)) — mineral

Amethyst with Quartz Vein

SiO2 (Silicon Dioxide)

Quartz (possibly Citrine or Smoky Quartz variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Quartz and Iron Oxide (Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions) — mineral

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Ironstone / Hematite Concretion (Iron oxide / Fe2O3) — sedimentary

Ironstone / Hematite Concretion

Iron oxide / Fe2O3

Feldspar (with Quartz / Iron Staining) (Potassium Feldspar / Plagioclase (KAlSi3O8 - NaAlSi3O8 to CaAl2Si2O8)) — mineral

Feldspar (with Quartz / Iron Staining)

Potassium Feldspar / Plagioclase (KAlSi3O8 - NaAlSi3O8 to CaAl2Si2O8)

Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)

Calcium Carbonate (CaCO3)

Pink Quartz (Rose Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Pink Quartz (Rose Quartz variant)

Silicon Dioxide (SiO2)

Limonite / Goethite (Ironstone) (Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O) — sedimentary

Limonite / Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O

Quartz (Smoky/Milky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Chert) (Cryptocrystalline Quartz (SiO2)) — mineral

Yellow Chalcedony (Agate/Chert)

Cryptocrystalline Quartz (SiO2)

Quartz with Mafic/Chlorite Veins (Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining) — metamorphic

Quartz with Mafic/Chlorite Veins

Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining

Diamond (appearing as a jewelry centerpiece) (Diamond (Formula: C)) — mineral

Diamond (appearing as a jewelry centerpiece)

Diamond (Formula: C)