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

Chevron Amethyst (Silicon Dioxide with Iron Impurities (SiO2)) — mineral

Chevron Amethyst

Silicon Dioxide with Iron Impurities (SiO2)

Amethyst (Quartz (SiO2)) — gemstone

Amethyst

Quartz (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

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

Aventurine (Quartz (Variety Aventurine), SiO2) — mineral

Aventurine

Quartz (Variety Aventurine), SiO2

Agate (SiO2) — Mineral/Gemstone

Agate

SiO2

Mineral/Gemstone

Citrine (Heat-Treated Amethyst) (Silicon Dioxide (SiO2)) — mineral

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite) (Silicon Dioxide (SiO2) with trace impurities) — mineral

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2) with trace impurities

Golden Healer Quartz (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Golden Healer Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Titanium Aura Quartz (Titanium-coated Silicon Dioxide (SiO2)) — mineral

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Aura Quartz (specifically Titanium Aura Quartz) (Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)) — mineral

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz geode (Quartz (SiO₂), likely a quartz-lined geode; the white crystals may include calcite) — mineral

Quartz geode

Quartz (SiO₂), likely a quartz-lined geode; the white crystals may include calcite

Likely bismuth crystal (Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen) — mineral

Likely bismuth crystal

Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen

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

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

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

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

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

Raw quartz crystal

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

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

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Likely smoky quartz crystal fragment (Quartz (SiO₂), probably smoky quartz) — mineral

Likely smoky quartz crystal fragment

Quartz (SiO₂), probably smoky quartz

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz geode / druzy quartz (Quartz (SiO₂), likely a small chalcedony-lined geode with drusy quartz crystals) — mineral

Quartz geode / druzy quartz

Quartz (SiO₂), likely a small chalcedony-lined geode with drusy quartz crystals

Small greenish crystal/mineral fragment (Indeterminate; possibly olivine, quartz, or a green gemstone fragment) — mineral

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Desert Rose Selenite (Gypsum) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Desert Rose Selenite (Gypsum)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Likely milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Amethyst and Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Amethyst and Milky Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Small translucent quartz fragment (Quartz (SiO₂), possibly milky or near-colorless quartz) — mineral

Small translucent quartz fragment

Quartz (SiO₂), possibly milky or near-colorless quartz

Quartz geode (Quartz (SiO₂), likely a quartz-lined geode in a carbonate-rich host) — mineral

Quartz geode

Quartz (SiO₂), likely a quartz-lined geode in a carbonate-rich host

Tumbled Black Stone (Unknown, possibly Obsidian, Onyx, or Tourmaline) — igneous or mineral

Tumbled Black Stone

Unknown, possibly Obsidian, Onyx, or Tourmaline

igneous or mineral

White selenite (gypsum) (Gypsum, CaSO₄·2H₂O; selenite is its crystalline variety) — mineral

White selenite (gypsum)

Gypsum, CaSO₄·2H₂O; selenite is its crystalline variety

Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite (Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃) — metamorphic

Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite

Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃

Prasiolite and Quartz Crystal Cluster (Quartz (SiO2); Prasiolite is a variety of Quartz) — mineral

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Calcite crystal cluster (Calcite, CaCO₃) — mineral

Calcite crystal cluster

Calcite, CaCO₃

Amethyst crystal cluster (Quartz (SiO₂), purple variety known as amethyst) — mineral

Amethyst crystal cluster

Quartz (SiO₂), purple variety known as amethyst

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Rough Diamond (Uncut Diamond) (Native Carbon (C)) — gemstone

Rough Diamond (Uncut Diamond)

Native Carbon (C)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Amethyst Quartz Druse

Silicon Dioxide (SiO2) with iron impurities

Calcite rosette (possibly fossilized shell fragment) (Calcite, CaCO₃; crystal habit appears botryoidal/rosette-like) — mineral

Calcite rosette (possibly fossilized shell fragment)

Calcite, CaCO₃; crystal habit appears botryoidal/rosette-like

Amethyst (Rough Crystal) (Silicon Dioxide (SiO2 with ferric iron impurities)) — mineral

Amethyst (Rough Crystal)

Silicon Dioxide (SiO2 with ferric iron impurities)