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

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

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

Quartz Crystal Point

Silicon Dioxide (SiO2)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

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

Quartz (Rock Crystal)

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)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Strawberry Quartz (Quartz with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Tumbled amethyst-bearing quartz (Quartz, SiO₂; purple coloration from iron-related defects and irradiation) — mineral

Tumbled amethyst-bearing quartz

Quartz, SiO₂; purple coloration from iron-related defects and irradiation

Rose Quartz (Silicon Dioxide (SiO2) with trace impurities) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace impurities

Amethyst cluster (Amethyst, purple quartz (SiO₂)) — mineral

Amethyst cluster

Amethyst, purple quartz (SiO₂)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Raw greenish-blue quartz-bearing mineral specimen (Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests) — mineral

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Clear quartz (rock crystal) (Quartz, silicon dioxide (SiO₂)) — mineral

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Small quartz crystal fragment (Quartz, SiO₂) — mineral

Small quartz crystal fragment

Quartz, SiO₂

Peach/orange calcite crystal (Calcite (calcium carbonate, CaCO₃)) — mineral

Peach/orange calcite crystal

Calcite (calcium carbonate, CaCO₃)

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

Clear quartz crystal (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Emerald crystal in host rock (Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)) — gemstone

Emerald crystal in host rock

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

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

Quartz Crystal (Smoky Quartz)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Raw quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely included or iron-stained quartz

Amethyst (Scepter Quartz) (Silicon Dioxide (SiO2) with Iron impurities) — mineral

Amethyst (Scepter Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Amethyst/Smoky Quartz Cluster (Silicon Dioxide (SiO2) with iron and aluminum impurities) — mineral

Amethyst/Smoky Quartz Cluster

Silicon Dioxide (SiO2) with iron and aluminum impurities

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

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

Amethyst (Geode Fragment)

Silicon Dioxide (SiO2 with iron impurities)

Pink tourmaline (rubellite), faceted gemstone (Elbaite, a lithium-bearing tourmaline; approximate formula Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — gemstone

Pink tourmaline (rubellite), faceted gemstone

Elbaite, a lithium-bearing tourmaline; approximate formula Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

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

Quartz crystal beads

Quartz (silicon dioxide, SiO₂)

Raw quartz crystal (Quartz (silicon dioxide, SiO₂), likely milky or included quartz) — mineral

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Polished citrine quartz point (Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst) — mineral

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Quartz crystal-bearing rock (Quartz (SiO₂), likely a milky/clear quartz vein specimen) — mineral

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Likely black tourmaline (schorl) (Schorl, black tourmaline; NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Likely black tourmaline (schorl)

Schorl, black tourmaline; NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Limestone with Calcite Vug (Calcium Carbonate (CaCO3) in Sedimentary Matrix) — sedimentary

Limestone with Calcite Vug

Calcium Carbonate (CaCO3) in Sedimentary Matrix

Quartz crystal cluster with dark tourmaline and iron staining (Quartz (SiO₂), likely with schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)) — mineral

Quartz crystal cluster with dark tourmaline and iron staining

Quartz (SiO₂), likely with schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Blue crystal/mineral specimen (possibly blue quartz or dyed stone) (Uncertain from photograph; possible quartz, SiO₂, or a blue copper-bearing mineral) — mineral

Blue crystal/mineral specimen (possibly blue quartz or dyed stone)

Uncertain from photograph; possible quartz, SiO₂, or a blue copper-bearing mineral

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)