Rock Identifier

Category

Crystal

Browse crystal specimens identified by the Rock Identifier community.

Learn about Crystal in the encyclopedia

Amethyst

Ametrine

Apophyllite

Aquamarine Crystal

Aquamarine Crystal

Aventurine

Blue Quartz

Brandberg Amethyst

Brandberg Amethyst

Cactus Quartz

Cathedral Quartz

Cathedral Quartz

Chevron Amethyst

Chevron Amethyst

Clear Quartz

Danburite

Calcite crystal cluster (Calcite, calcium carbonate (CaCO₃)) — mineral

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

Selenite (gypsum crystal) (Gypsum, CaSO₄·2H₂O; transparent-to-translucent variety commonly called selenite) — mineral

Selenite (gypsum crystal)

Gypsum, CaSO₄·2H₂O; transparent-to-translucent variety commonly called selenite

Honey calcite crystal (Calcite (calcium carbonate, CaCO₃)) — mineral

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

Iridescent bismuth crystal (Bismuth (Bi), commonly laboratory-grown) — mineral

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Calcite crystal cluster (Calcite, calcium carbonate (CaCO₃)) — mineral

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

Calcite crystal specimen (Calcite — calcium carbonate, CaCO₃) — mineral

Calcite crystal specimen

Calcite — calcium carbonate, CaCO₃

Amethyst crystal cluster (Amethyst, purple quartz (SiO₂) colored mainly by iron impurities and irradiation) — mineral

Amethyst crystal cluster

Amethyst, purple quartz (SiO₂) colored mainly by iron impurities and irradiation

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Desert Rose (Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)) — mineral

Desert Rose

Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)

Pyrite in Matrix (Iron Disulfide (FeS2)) — mineral

Pyrite in Matrix

Iron Disulfide (FeS2)

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Dyed Quartz (imitating Emerald/Green Quartz) (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Quartz (imitating Emerald/Green Quartz)

Silicon Dioxide (SiO2) with artificial pigment

Quartz geode or druzy quartz specimen (Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock) — mineral

Quartz geode or druzy quartz specimen

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Clear calcite crystal fragment (Calcite (calcium carbonate, CaCO₃)) — mineral

Clear calcite crystal fragment

Calcite (calcium carbonate, CaCO₃)

Blue-green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone

Amethyst

Quartz (Silicon Dioxide, SiO2)

Polished yellow chalcedony (likely quartz pebble) (Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper) — mineral

Polished yellow chalcedony (likely quartz pebble)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Granitic Pegmatite (Pegmatite containing Quartz, Feldspar, and Muscovite mica) — igneous

Granitic Pegmatite

Pegmatite containing Quartz, Feldspar, and Muscovite mica

Pegmatite (Granitic Pegmatite) — igneous

Pegmatite

Granitic Pegmatite

Pegmatite (Granitic) (Granitic Pegmatite) — igneous

Pegmatite (Granitic)

Granitic Pegmatite

Granitic Pegmatite (Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica) — igneous

Granitic Pegmatite

Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica

Diamond (Uncut Crystal) (Carbon (C)) — mineral

Diamond (Uncut Crystal)

Carbon (C)

Chlorite Phantom Quartz (Silicon Dioxide (SiO2) with Chlorite group inclusions [(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6]) — mineral

Chlorite Phantom Quartz

Silicon Dioxide (SiO2) with Chlorite group inclusions [(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6]

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic Glass with Cristobalite Inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

Snowflake Obsidian (Spherulitic Volcanic Glass (SiO2)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2)

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Clear Quartz (Rock Crystal) (Quartz (SiO₂)) — Mineral

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Titanium Aura Quartz (Titanium-coated Silicon Dioxide (SiO2)) — gemstone

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Crystal Fragment) (Quartz / Silicon Dioxide (SiO2)) — mineral

Quartz (Crystal Fragment)

Quartz / Silicon Dioxide (SiO2)

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz Druze (on Matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Clear quartz crystal (likely tumbled or polished) (Quartz, silicon dioxide (SiO₂)) — mineral

Clear quartz crystal (likely tumbled or polished)

Quartz, silicon dioxide (SiO₂)

Small rough quartz crystals, likely quartz/agate fragments (Quartz (SiO₂), possibly chalcedony or included quartz) — mineral

Small rough quartz crystals, likely quartz/agate fragments

Quartz (SiO₂), possibly chalcedony or included quartz

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Carnelian and White Quartz Bracelet (Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz) — mineral

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz