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

Quartz geode (Quartz, SiO₂; likely a chalcedony-lined geode with inward-growing quartz crystals) — mineral

Quartz geode

Quartz, SiO₂; likely a chalcedony-lined geode with inward-growing quartz crystals

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Faceted quartz crystal sphere (likely rock crystal) (Quartz, silicon dioxide (SiO₂)) — gemstone

Faceted quartz crystal sphere (likely rock crystal)

Quartz, silicon dioxide (SiO₂)

Scolecite (Scolecite (CaAl2Si3O10·3H2O)) — mineral

Scolecite

Scolecite (CaAl2Si3O10·3H2O)

Pyrite (fool’s gold) (Iron disulfide, FeS₂; usually cubic or pyritohedral crystals) — mineral

Pyrite (fool’s gold)

Iron disulfide, FeS₂; usually cubic or pyritohedral crystals

Smoky quartz crystal (Quartz, SiO₂ (smoky variety)) — mineral

Smoky quartz crystal

Quartz, SiO₂ (smoky variety)

Selenite (gypsum) crystal (Gypsum, CaSO₄·2H₂O; variety selenite) — mineral

Selenite (gypsum) crystal

Gypsum, CaSO₄·2H₂O; variety selenite

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

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Aquamarine (Beryllium Aluminum Silicate (Be3Al2Si6O18)) — gemstone

Aquamarine

Beryllium Aluminum Silicate (Be3Al2Si6O18)

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

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Red garnet crystal (possible almandine) (Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃) — mineral

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Amethyst cluster (Amethyst, purple quartz (SiO₂)) — mineral

Amethyst cluster

Amethyst, purple quartz (SiO₂)

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

Clear quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Quartz geode (Quartz, silicon dioxide (SiO₂), likely a chalcedony-lined geode with drusy quartz crystals) — mineral

Quartz geode

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

Natural quartz crystal (likely herkimer-style quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Natural quartz crystal (likely herkimer-style quartz)

Quartz, silicon dioxide (SiO₂)

Smoky quartz crystal cluster (Quartz, silicon dioxide (SiO₂), likely smoky variety with possible feldspar or matrix inclusions) — mineral

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely smoky variety with possible feldspar or matrix inclusions

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

Likely quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Smoky quartz crystal cluster (Quartz, silicon dioxide (SiO₂), likely smoky quartz with milky quartz matrix) — mineral

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely smoky quartz with milky quartz matrix

Quartz crystal fragment (likely milky/inclusion-rich quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal fragment (likely milky/inclusion-rich quartz)

Quartz, silicon dioxide (SiO₂)

Diamond-set earring (Diamond (carbon, C); crystal structure: cubic) — gemstone

Diamond-set earring

Diamond (carbon, C); crystal structure: cubic

Pyrite (iron pyrite) (Iron sulfide, FeS₂; cubic crystal system) — mineral

Pyrite (iron pyrite)

Iron sulfide, FeS₂; cubic crystal system

Aragonite (Onyx Marble) (Calcium Carbonate (CaCO3), Orthorhombic crystal system) — mineral

Aragonite (Onyx Marble)

Calcium Carbonate (CaCO3), Orthorhombic crystal system

Quartz Crystal (Silicon dioxide (SiO2)) — mineral

Quartz Crystal

Silicon dioxide (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

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

Quartz (Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz crystal (Quartz (silicon dioxide, SiO₂), possibly milky quartz) — mineral

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Calcite crystal (Calcite (CaCO₃)) — mineral

Calcite crystal

Calcite (CaCO₃)

Calcite crystal (Calcite (calcium carbonate, CaCO₃)) — mineral

Calcite crystal

Calcite (calcium carbonate, CaCO₃)

Quartz Crystal (Quartz (SiO₂)) — Mineral

Quartz Crystal

Quartz (SiO₂)

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

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

Quartz (Crystal)

Silicon Dioxide (SiO2)

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

Quartz (Crystal)

Silicon Dioxide (SiO2)

Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Aquamarine (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Aquamarine (Tumbled) (Beryl (Be3Al2Si6O18)) — gemstone

Aquamarine (Tumbled)

Beryl (Be3Al2Si6O18)