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

Druzy Quartz on Sandstone (Silicon Dioxide (SiO2) with Quartz Crystals on Clastic Sedimentary Rock) — sedimentary

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) with Quartz Crystals on Clastic Sedimentary Rock

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Purple amethyst crystal specimen (Amethyst, purple variety of quartz (SiO₂)) — mineral

Purple amethyst crystal specimen

Amethyst, purple variety of quartz (SiO₂)

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

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz crystal (Quartz (Silicon dioxide, SiO2)) — mineral

Quartz crystal

Quartz (Silicon dioxide, SiO2)

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

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

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

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Amethyst crystal (Quartz, SiO₂; purple variety colored mainly by iron impurities and irradiation) — mineral

Amethyst crystal

Quartz, SiO₂; purple variety colored mainly by iron impurities and irradiation

Bismuth crystal (Bismuth (Bi), synthetic laboratory-grown crystal) — mineral

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

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

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Green apatite crystal (Apatite group; likely fluorapatite, Ca₅(PO₄)₃F) — mineral

Green apatite crystal

Apatite group; likely fluorapatite, Ca₅(PO₄)₃F

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

Purple fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Calcite crystal aggregate (Calcite (CaCO₃), likely cave or hydrothermal carbonate formation) — mineral

Calcite crystal aggregate

Calcite (CaCO₃), likely cave or hydrothermal carbonate formation

Botryoidal chalcedony (possibly druzy quartz) (Microcrystalline quartz, SiO₂; surface may include small quartz crystals) — mineral

Botryoidal chalcedony (possibly druzy quartz)

Microcrystalline quartz, SiO₂; surface may include small quartz crystals

Quartz cluster (likely milky quartz) (Quartz, silicon dioxide (SiO₂), trigonal crystal system) — mineral

Quartz cluster (likely milky quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Quartz Crystal Geode / Druzy Cluster (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Geode / Druzy Cluster

Silicon Dioxide (SiO2)

Selenite (gypsum) crystal (Gypsum, CaSO₄·2H₂O; fibrous variety often called satin spar) — mineral

Selenite (gypsum) crystal

Gypsum, CaSO₄·2H₂O; fibrous variety often called satin spar

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

Milky quartz crystal cluster

Quartz, silicon dioxide (SiO₂)

Citrine quartz crystal (Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine) — mineral

Citrine quartz crystal

Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine

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

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Amethyst (purple quartz crystal cluster) (Quartz, SiO₂; amethyst is purple, iron-bearing quartz) — mineral

Amethyst (purple quartz crystal cluster)

Quartz, SiO₂; amethyst is purple, iron-bearing quartz

Small purple crystal, possibly amethyst (Quartz (SiO₂), tentatively amethyst) — mineral

Small purple crystal, possibly amethyst

Quartz (SiO₂), tentatively amethyst

Colorless quartz crystal (likely quartz fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled citrine (possibly heat-treated amethyst) (Quartz, SiO₂; trigonal crystal system) — gemstone

Tumbled citrine (possibly heat-treated amethyst)

Quartz, SiO₂; trigonal crystal system

Purple druzy quartz (likely dyed or coated) (Quartz, SiO₂ (trigonal crystal system)) — mineral

Purple druzy quartz (likely dyed or coated)

Quartz, SiO₂ (trigonal crystal system)

Small natural quartz crystal, possibly iron-stained quartz (Quartz (SiO₂), trigonal crystal system) — mineral

Small natural quartz crystal, possibly iron-stained quartz

Quartz (SiO₂), trigonal crystal system

Rose quartz (rough fragment) (Quartz, SiO₂; trigonal crystal system) — mineral

Rose quartz (rough fragment)

Quartz, SiO₂; trigonal crystal system

Likely rough rose quartz (Quartz, SiO₂ (trigonal crystal structure)) — mineral

Likely rough rose quartz

Quartz, SiO₂ (trigonal crystal structure)

River Pebble (likely Quartzite or Chert) (Silicon Dioxide (SiO2) crystal conglomerate) — sedimentary or metamorphic

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2) crystal conglomerate

sedimentary or metamorphic

Citrine (natural quartz crystal) (Quartz, SiO₂; the yellow-brown color may be natural citrine or heat-treated amethyst) — mineral

Citrine (natural quartz crystal)

Quartz, SiO₂; the yellow-brown color may be natural citrine or heat-treated amethyst

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

Raw amethyst quartz crystal

Quartz, silicon dioxide (SiO₂), purple variety amethyst

Amethyst crystal (Amethyst, purple variety of quartz (SiO₂), trigonal crystal system) — mineral

Amethyst crystal

Amethyst, purple variety of quartz (SiO₂), trigonal crystal system

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

Smoky quartz crystal

Quartz (silicon dioxide, SiO₂), likely smoky quartz

Phantom Quartz (Chlorite Inclusion) (Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Al)6(Si,Al)4O10(OH)8) — mineral

Phantom Quartz (Chlorite Inclusion)

Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Al)6(Si,Al)4O10(OH)8

Calcite crystal (Calcite (CaCO₃)) — mineral

Calcite crystal

Calcite (CaCO₃)

Polished brown quartz crystal (likely smoky quartz) (Quartz, silicon dioxide (SiO₂); probable smoky variety) — mineral

Polished brown quartz crystal (likely smoky quartz)

Quartz, silicon dioxide (SiO₂); probable smoky variety

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

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Blue kyanite crystal fragment (Kyanite — Al₂SiO₅) — mineral

Blue kyanite crystal fragment

Kyanite — Al₂SiO₅

Small rough quartz crystal (Quartz, silicon dioxide (SiO₂)) — mineral

Small rough quartz crystal

Quartz, silicon dioxide (SiO₂)

Likely amethyst crystal fragment (Quartz, SiO₂; purple coloration from iron-related defects and irradiation) — mineral

Likely amethyst crystal fragment

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

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

Smoky quartz crystal fragment

Quartz, silicon dioxide (SiO₂), likely smoky variety

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

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)