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

Small purple crystal fragment, possibly amethyst (Quartz (SiO₂), variety amethyst; identification uncertain from the image) — mineral

Small purple crystal fragment, possibly amethyst

Quartz (SiO₂), variety amethyst; identification uncertain from the image

Amethyst (purple quartz) (Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation) — mineral

Amethyst (purple quartz)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Pyrite (fool’s gold) (Pyrite, iron sulfide (FeS₂)) — mineral

Pyrite (fool’s gold)

Pyrite, iron sulfide (FeS₂)

Amethyst (rough crystal fragment) (Purple quartz, silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation) — gemstone

Amethyst (rough crystal fragment)

Purple quartz, silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

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)

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)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded agate geode (Microcrystalline quartz (chalcedony), SiO₂, with quartz crystals) — mineral

Banded agate geode

Microcrystalline quartz (chalcedony), SiO₂, with quartz crystals

Quartz crystal cluster (Quartz (SiO₂), likely iron-stained; exact variety uncertain) — mineral

Quartz crystal cluster

Quartz (SiO₂), likely iron-stained; exact variety uncertain

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Raw amethyst crystal

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

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

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Blue Sapphire (likely costume glass imitation) (Corundum (Al2O3) with iron/titanium impurities) — mineral

Blue Sapphire (likely costume glass imitation)

Corundum (Al2O3) with iron/titanium impurities

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

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

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

Quartz crystal cluster

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

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

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Kyanite (Kyanite (Al2SiO5)) — mineral

Kyanite

Kyanite (Al2SiO5)

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Desert Rose

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

Quartz Geode with Agate (Silicon Dioxide (SiO2)) — mineral

Quartz Geode with Agate

Silicon Dioxide (SiO2)

Blue Chalcedony Cube (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony Cube

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite) (Silicon Dioxide (SiO2)) — mineral

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2)

Amethyst Geode Fragment (Quartz (SiO2) with trace iron impurities) — mineral

Amethyst Geode Fragment

Quartz (SiO2) with trace iron impurities

Dyed Quartz Pendant (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Quartz Pendant

Silicon Dioxide (SiO2) with artificial dye

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

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Agate Geode (Silicon dioxide (SiO2) - Chalcedony) — mineral

Agate Geode

Silicon dioxide (SiO2) - Chalcedony

Amethyst (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Amethyst (Tumbled)

Silicon Dioxide (SiO2)

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

Citrine or Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Green Aventurine (Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Tumbled Amethyst (Silicon Dioxide (SiO2)) — mineral

Tumbled Amethyst

Silicon Dioxide (SiO2)

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

Desert Rose

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

Sunstone and Garnet (Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8) and Almandine Garnet (Fe3Al2(SiO4)3)) — gemstone

Sunstone and Garnet

Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8) and Almandine Garnet (Fe3Al2(SiO4)3)

Blue Quartz (Silicon Dioxide (SiO2)) — mineral

Blue Quartz

Silicon Dioxide (SiO2)

Jasper Mushroom Carving (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — mineral

Jasper Mushroom Carving

Silicon Dioxide (Microcrystalline Quartz, SiO2)

White Chalcedony (Silicon Dioxide (SiO2)) — mineral

White Chalcedony

Silicon Dioxide (SiO2)

Moss Agate (Crescent Moon Shape) (Silicon Dioxide (SiO2) with iron/manganese inclusions) — mineral

Moss Agate (Crescent Moon Shape)

Silicon Dioxide (SiO2) with iron/manganese inclusions

Green Calcite or Prasiolite (Green Quartz) (Calcium carbonate (CaCO3) or Silicon dioxide (SiO2)) — mineral

Green Calcite or Prasiolite (Green Quartz)

Calcium carbonate (CaCO3) or Silicon dioxide (SiO2)

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

Rose Quartz

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

Amethyst (Silicon Dioxide (Quartz variety)) — gemstone

Amethyst

Silicon Dioxide (Quartz variety)