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

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-rich pegmatite specimen (Pegmatite, composed mainly of quartz (SiO₂), feldspar, and minor mica/iron oxides) — igneous

Quartz-rich pegmatite specimen

Pegmatite, composed mainly of quartz (SiO₂), feldspar, and minor mica/iron oxides

Clear Quartz / Diamond (untested) (Silicon Dioxide (SiO2) or Carbon (C)) — mineral

Clear Quartz / Diamond (untested)

Silicon Dioxide (SiO2) or Carbon (C)

Pegmatite (Granitic Pegmatite) — igneous

Pegmatite

Granitic Pegmatite

Granitic Pegmatite (Pegmatitic Granite) — igneous

Granitic Pegmatite

Pegmatitic Granite

Granatic Pegmatite (Pegmatitic Granite) — igneous

Granatic Pegmatite

Pegmatitic Granite

Granitic Pegmatite (Granitic Pegmatite (principally Quartz, Feldspar, and Mica)) — igneous

Granitic Pegmatite

Granitic Pegmatite (principally Quartz, Feldspar, and Mica)

Quartz crystal (likely included or coated quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal (likely included or coated quartz)

Quartz, silicon dioxide (SiO₂)

Sandstone with Quartz Crystal Infill (Quartz-cemented quartz arenite) — sedimentary

Sandstone with Quartz Crystal Infill

Quartz-cemented quartz arenite

Iron-stained quartz crystal (Quartz (SiO₂), likely iron-oxide-coated or included) — mineral

Iron-stained quartz crystal

Quartz (SiO₂), likely iron-oxide-coated or included

Green Sheen Obsidian (Volcanic Glass (SiO2 with microscopic inclusions)) — igneous

Green Sheen Obsidian

Volcanic Glass (SiO2 with microscopic inclusions)

Black Obsidian (Obsidian (Amorphous volcanic glass, SiO2)) — igneous

Black Obsidian

Obsidian (Amorphous volcanic glass, SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz crystal cluster, possibly iron-stained quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Quartz crystal cluster, possibly iron-stained quartz

Quartz (silicon dioxide, SiO₂)

Blue chalcedony crystal pendant (Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz) — gemstone

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz

Amethyst (rough crystal fragment) (Quartz, SiO₂; purple coloration from iron impurities and irradiation) — gemstone

Amethyst (rough crystal fragment)

Quartz, SiO₂; purple coloration from iron impurities and irradiation

Iron-stained quartz crystal (Quartz (SiO₂), likely limonite/goethite inclusions or surface coating) — mineral

Iron-stained quartz crystal

Quartz (SiO₂), likely limonite/goethite inclusions or surface coating

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

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

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Quartz crystal point (likely smoky or iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal point (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Garnet Schist (Almandine-Garnet Schist) — metamorphic

Garnet Schist

Almandine-Garnet Schist

Blue Quartz (Silicon Dioxide (SiO2) with microscopic inclusions) — mineral

Blue Quartz

Silicon Dioxide (SiO2) with microscopic inclusions

Black Obsidian (Volcanic Glass (SiO2 with impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 with impurities)

Galena (Lead(II) sulfide (PbS)) — mineral

Galena

Lead(II) sulfide (PbS)

Lapis Lazuli (Lazurite crystals on Marble) (Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]) — metamorphic

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Pink Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Pink Quartz Pebble

Silicon Dioxide (SiO2)

Citrine Geode (Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2) — mineral

Citrine Geode

Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2

Pink Quartz (Silicon Dioxide (SiO2)) — mineral

Pink Quartz

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Amethyst and Rose Quartz Beads (Crystalline Quartz (SiO2) with trace elements) — gemstone

Amethyst and Rose Quartz Beads

Crystalline Quartz (SiO2) with trace elements

Amethyst Quartz fragment (SiO2 (Silicon Dioxide with Iron impurities)) — mineral

Amethyst Quartz fragment

SiO2 (Silicon Dioxide with Iron impurities)

Agate (SiO2) — Mineral

Agate

SiO2

Amethyst (Polished Point) (Crystalline Quartz (SiO2 with iron impurities)) — mineral

Amethyst (Polished Point)

Crystalline Quartz (SiO2 with iron impurities)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Crazy Lace Agate (Chalcedony (SiO2)) — Mineral

Crazy Lace Agate

Chalcedony (SiO2)

Milky Quartz with Iron Staining (Quartz (Silicon Dioxide) - SiO2) — mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide) - SiO2

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Orange Calcite (Dogtooth/Cluster) (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite (Dogtooth/Cluster)

Calcium Carbonate (CaCO3)

Kyanite (Kyanite (Al2SiO5)) — mineral

Kyanite

Kyanite (Al2SiO5)

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

Purple fluorite (likely cubic crystal aggregate)

Fluorite, calcium fluoride (CaF₂)

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

Quartz (Crystal Fragment)

Silicon Dioxide (SiO2)