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

Citrine (Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

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

Pink Quartz

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

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Dyed Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Dyed Agate

Silicon Dioxide (Chalcedony), SiO2

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Pink Quartz (Silicon Dioxide (SiO2)) — mineral

Pink Quartz

Silicon Dioxide (SiO2)

Rough quartz crystal, possibly milky quartz (Quartz, SiO₂; exact variety uncertain from the image) — mineral

Rough quartz crystal, possibly milky quartz

Quartz, SiO₂; exact variety uncertain from the image

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

Clear quartz crystal (likely quartz point or polished quartz)

Quartz, silicon dioxide (SiO₂)

Polished agate geode slice (Banded chalcedony (microcrystalline SiO₂), with a quartz crystal-lined cavity) — mineral

Polished agate geode slice

Banded chalcedony (microcrystalline SiO₂), with a quartz crystal-lined cavity

Quartz crystal cluster (Quartz (silicon dioxide, SiO₂), likely clear or milky quartz) — mineral

Quartz crystal cluster

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

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

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Amethyst (Silicon dioxide (Quartz variety), SiO2) — mineral

Amethyst

Silicon dioxide (Quartz variety), SiO2

Clear Quartz (Rock Crystal) Bracelet (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Rock Crystal) Bracelet

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz crystal fragment (Quartz (SiO₂), likely a small clear-to-gray crystal fragment) — mineral

Quartz crystal fragment

Quartz (SiO₂), likely a small clear-to-gray crystal fragment

Druzy agate/geode fragment (Quartz (SiO₂) crystals lining a chalcedony-rich cavity, likely an agate geode) — mineral

Druzy agate/geode fragment

Quartz (SiO₂) crystals lining a chalcedony-rich cavity, likely an agate geode

Schist with Schorl (Black Tourmaline) (NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — metamorphic

Schist with Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Quartz geode (Silica geode; predominantly microcrystalline and crystalline quartz (SiO₂), possibly with chalcedony and minor calcite) — mineral

Quartz geode

Silica geode; predominantly microcrystalline and crystalline quartz (SiO₂), possibly with chalcedony and minor calcite

Quartz with Chlorite inclusions (Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)) — mineral

Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)

Calcite crystal cluster (Calcite, CaCO₃) — mineral

Calcite crystal cluster

Calcite, CaCO₃

Diamond-set gold ring (Diamond (carbon, C; cubic crystal structure), set in a gold alloy) — gemstone

Diamond-set gold ring

Diamond (carbon, C; cubic crystal structure), set in a gold alloy

Polished quartz crystal specimen (Quartz, silicon dioxide (SiO₂), likely rock crystal or milky quartz) — mineral

Polished quartz crystal specimen

Quartz, silicon dioxide (SiO₂), likely rock crystal or milky quartz

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz geode (likely amethyst-bearing) (Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides) — mineral

Quartz geode (likely amethyst-bearing)

Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides

Almandine Garnet (Almandine (Fe3Al2(SiO4)3)) — gemstone

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Raw Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Green Tourmaline (Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) — mineral

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

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

Quartz Crystal on Matrix

Silicon Dioxide (SiO2)

Pyrite (fool’s gold) (Iron disulfide, FeS₂; commonly cubic or pyritohedral crystals) — mineral

Pyrite (fool’s gold)

Iron disulfide, FeS₂; commonly cubic or pyritohedral crystals

Clear quartz chips (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz chips

Quartz (silicon dioxide, SiO₂)

Quartz Crystal in Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal in Matrix

Silicon Dioxide (SiO2)

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Gypsum (desert rose and selenite) (Gypsum, CaSO₄·2H₂O; the left specimen resembles a desert rose, the right a selenite crystal) — mineral

Gypsum (desert rose and selenite)

Gypsum, CaSO₄·2H₂O; the left specimen resembles a desert rose, the right a selenite crystal

Granite (Granite (interlocking crystals of quartz, feldspar, and mica)) — igneous

Granite

Granite (interlocking crystals of quartz, feldspar, and mica)

Mahogany Obsidian (Volcanic Glass (SiO2 with iron and magnesium oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with iron and magnesium oxides)