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

Snowflake Obsidian (Volcanic Glass with Spherulite Inclusions (primarily SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (primarily SiO2)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

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

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Beaded mineral/crystal jewelry (likely turquoise and coral accents) (Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials) — gemstone

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

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

Tumbled quartz crystal (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Quartz with Tourmaline Inclusions (Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4) inclusions) — mineral

Quartz with Tourmaline Inclusions

Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4) inclusions

Pyrite (likely) (Iron disulfide, FeS₂; possibly a pyrite-rich sulfide nodule) — mineral

Pyrite (likely)

Iron disulfide, FeS₂; possibly a pyrite-rich sulfide nodule

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)

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

Herkimer Diamond (Quartz Crystal)

Silicon Dioxide (SiO2)

Kyanite in Quartz (Kyanite (Al2SiO5) with Quartz (SiO2)) — metamorphic

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Barite (Barium sulfate (BaSO4)) — mineral

Barite

Barium sulfate (BaSO4)

Unknown Rock Specimen — igneous

Unknown Rock Specimen

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz Point) (Silicon Dioxide (SiO2)) — mineral

Quartz (Clear Quartz Point)

Silicon Dioxide (SiO2)

Tumbled yellow-orange chalcedony (possibly yellow jasper) (Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration) — mineral

Tumbled yellow-orange chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Druzy quartz geode (Quartz, silicon dioxide (SiO₂), microcrystalline druzy coating) — mineral

Druzy quartz geode

Quartz, silicon dioxide (SiO₂), microcrystalline druzy coating

Granite cobble (Granite, predominantly quartz–feldspar–mica rock) — igneous

Granite cobble

Granite, predominantly quartz–feldspar–mica rock

Polished granite pebble (Granite, chiefly quartz, feldspar, and mica/amphibole) — igneous

Polished granite pebble

Granite, chiefly quartz, feldspar, and mica/amphibole

Chalcedony (Blue Dragon/Gray Chalcedony) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Blue Dragon/Gray Chalcedony)

Silicon Dioxide (SiO₂)

Milky Quartz / Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Milky Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with Cristobalite inclusions)

Ferruginous Quartz (Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)) — mineral

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Quartz Druzy (on Matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Quartz with Mica/Chlorite inclusions (Silicon Dioxide (SiO2) with phyllosilicate inclusions) — igneous/metamorphic mineral specimen

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

igneous/metamorphic mineral specimen

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Amethyst Cluster (Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst Cluster

Silicon Dioxide with Iron impurities (SiO2)

Prase Quartz on Feldspar (Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)) — mineral

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Rough Emerald (Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)) — mineral

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Rutilated Quartz (SiO2 (Quartz) with TiO2 (Rutile inclusions)) — Mineral

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Quartz-lined Geode / Chalcedony Nodule (Silicon Dioxide (SiO2)) — sedimentary

Quartz-lined Geode / Chalcedony Nodule

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Amethyst Point (Crystalline Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst Point

Crystalline Silicon Dioxide with Iron impurities (SiO2)

Aura Amethyst (Dyed/Coated) (Titanium-treated Silicon Dioxide (SiO2)) — mineral

Aura Amethyst (Dyed/Coated)

Titanium-treated Silicon Dioxide (SiO2)

Milky quartz (likely quartz-rich vein fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Ametrine (Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)) — mineral

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)