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 (Facet Cut / Polished) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Facet Cut / Polished)

Silicon Dioxide (SiO2)

Rough Emerald Crystals (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Rough Emerald Crystals

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Likely quartz crystal fragment (Quartz (SiO₂), possibly a small tumbled or cleaved fragment) — mineral

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Likely raw garnet crystal (Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)) — mineral

Likely raw garnet crystal

Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)

Mixed mineral and crystal specimens (Likely quartz varieties and other common minerals; exact identification is uncertain from the image) — mineral

Mixed mineral and crystal specimens

Likely quartz varieties and other common minerals; exact identification is uncertain from the image

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Clear quartz crystal (likely quartz point/fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Clear quartz crystal (likely quartz point/fragment)

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)

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Citrine (Heat-Treated Amethyst) (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2) with ferric iron impurities

Tumbled Citrine (Silicon Dioxide (Quartz variety)) — mineral

Tumbled Citrine

Silicon Dioxide (Quartz variety)

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

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Tumbled Amethyst and Smoky Quartz (Silicon Dioxide (SiO2) with impurities) — mineral

Tumbled Amethyst and Smoky Quartz

Silicon Dioxide (SiO2) with impurities

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

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Amethyst quartz crystal (Quartz, silicon dioxide (SiO₂), purple variety amethyst) — mineral

Amethyst quartz crystal

Quartz, silicon dioxide (SiO₂), purple variety amethyst

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

Quartz Crystal (Rough)

Silicon Dioxide (SiO2)

Milky Quartz (Druzy Coating) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Druzy Coating)

Silicon Dioxide (SiO2)

Rutilated Quartz (Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions) — mineral

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Quartz geode with drusy quartz crystals (Quartz, silicon dioxide (SiO₂), commonly colorless to milky crystalline quartz) — mineral

Quartz geode with drusy quartz crystals

Quartz, silicon dioxide (SiO₂), commonly colorless to milky crystalline quartz

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Clear quartz sphere (Quartz (silicon dioxide, SiO₂), likely rock crystal or low-grade milky quartz) — mineral

Clear quartz sphere

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

Amethyst quartz crystal cluster (Quartz, SiO₂; purple coloration from irradiation and trace iron) — mineral

Amethyst quartz crystal cluster

Quartz, SiO₂; purple coloration from irradiation and trace iron

Gypsum crystal cluster (selenite/ satin-spar variety) (Gypsum — calcium sulfate dihydrate, CaSO₄·2H₂O) — mineral

Gypsum crystal cluster (selenite/ satin-spar variety)

Gypsum — calcium sulfate dihydrate, CaSO₄·2H₂O

Amethyst Sphere (Crystalline Quartz (SiO2 with iron impurities)) — mineral

Amethyst Sphere

Crystalline Quartz (SiO2 with iron impurities)

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

Pyrite in Matrix

Iron Sulfide (FeS2)

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

Smoky Quartz

Quartz (Silicon Dioxide) - SiO2

Quartz Crystal Cluster (Pipe-like or Candle Quartz Growth) (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster (Pipe-like or Candle Quartz Growth)

Silicon Dioxide (SiO2)