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

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal) Bead

Silicon Dioxide (SiO2)

Calcite crystal cluster (dogtooth/saddle calcite) (Calcite — calcium carbonate, CaCO₃) — mineral

Calcite crystal cluster (dogtooth/saddle calcite)

Calcite — calcium carbonate, CaCO₃

Amethyst (Amethyst (SiO2 with Iron impurities)) — mineral

Amethyst

Amethyst (SiO2 with Iron impurities)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Black tourmaline (schorl) crystal fragments (Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Black tourmaline (schorl) crystal fragments

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Quartz crystal fragment (likely milky/included quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal fragment (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Orange-yellow calcite crystal (Calcite (CaCO₃), likely honey/orange calcite) — mineral

Orange-yellow calcite crystal

Calcite (CaCO₃), likely honey/orange calcite

Quartz (Smoky/Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Cluster on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster on Matrix

Silicon Dioxide (SiO2)

Quartz (Rock Crystal) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Raw quartz crystal (likely smoky or iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Raw quartz crystal (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Quartz Sand Grain / Micro Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Quartzite with Quartz Crystal Vug (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite with Quartz Crystal Vug

Metamorphic Quartzite (SiO2)

Gypsum (Selenite crystals in Halite/Clay matrix) (Calcium Sulfate Dihydrate (CaSO4·2H2O)) — mineral

Gypsum (Selenite crystals in Halite/Clay matrix)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Granite (phaneritic background) with Limestone/Calcite carving (Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)) — igneous and sedimentary

Granite (phaneritic background) with Limestone/Calcite carving

Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)

igneous and sedimentary

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

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 Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Smoky quartz crystal cluster (Quartz, silicon dioxide (SiO₂), likely smoky variety) — mineral

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely smoky variety

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

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Smoky Quartz and Feldspar Pegmatite (Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)) — igneous

Smoky Quartz and Feldspar Pegmatite

Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)

Quartz crystal fragment (Quartz (silicon dioxide, SiO₂), likely ordinary or smoky quartz) — mineral

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂), likely ordinary or smoky quartz

Tumbled quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

Selenite (gypsum crystal) (Gypsum, calcium sulfate dihydrate (CaSO₄·2H₂O), likely the variety selenite) — mineral

Selenite (gypsum crystal)

Gypsum, calcium sulfate dihydrate (CaSO₄·2H₂O), likely the variety selenite

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

Calcite crystal fragment

Calcite (calcium carbonate, CaCO₃)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Agate Geode (Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety) — Mineral

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety

Aragonite crystal cluster (Aragonite, orthorhombic calcium carbonate (CaCO₃)) — mineral

Aragonite crystal cluster

Aragonite, orthorhombic calcium carbonate (CaCO₃)

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

Quartz Crystal Fragment

Quartz (Silicon Dioxide, SiO2)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

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

Quartz (Crystal Fragment)

Silicon Dioxide (SiO2)

Quartz crystal cluster (Quartz (silicon dioxide, SiO₂)) — mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Milky quartz crystal (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Purple fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Purple fluorite crystal

Fluorite (calcium fluoride, CaF₂)

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

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxide-coated

Green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

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)

Raw quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Raw quartz crystal

Quartz (silicon dioxide, SiO₂)

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

Quartz (Raw Crystal)

Silicon Dioxide (SiO2)