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

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

Milky quartz

Quartz, silicon dioxide (SiO₂)

Blue-gray kyanite crystal (Kyanite, Al₂SiO₅) — mineral

Blue-gray kyanite crystal

Kyanite, Al₂SiO₅

Rock crystal (clear quartz) (Quartz, silicon dioxide (SiO₂), likely milky/included quartz) — mineral

Rock crystal (clear quartz)

Quartz, silicon dioxide (SiO₂), likely milky/included quartz

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

Quartz geode

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

Small unidentified mineral specimen (Indeterminate from image; possibly a quartz-family crystal or sulfide mineral) — mineral

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Likely rough quartz crystal fragment (Quartz, SiO₂) — mineral

Likely rough quartz crystal fragment

Quartz, SiO₂

Pyrite (likely a small pyrite crystal aggregate) (Pyrite, iron disulfide (FeS₂)) — mineral

Pyrite (likely a small pyrite crystal aggregate)

Pyrite, iron disulfide (FeS₂)

Natural quartz crystal cluster / massive quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Natural quartz crystal cluster / massive quartz

Quartz (silicon dioxide, SiO₂)

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

Milky quartz (likely quartz crystal)

Quartz, silicon dioxide (SiO₂)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pink tourmaline crystal (likely polished or rough-cut) (Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃) — gemstone

Pink tourmaline crystal (likely polished or rough-cut)

Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃

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

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), smoky variety

Likely clear quartz crystal or glass-like gemstone (Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image) — mineral

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

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

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Clear quartz crystal (Quartz (silicon dioxide, SiO₂), likely milky or included rock crystal) — mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included rock crystal

Goldstone (Brown) (Aventurine Glass (Silicon Dioxide infused with Copper crystals)) — mineraloid (man-made glass)

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

mineraloid (man-made glass)

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

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

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

Emerald In Matrix

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

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

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Aquamarine (Beryl) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Raw Emerald (Beryl (Be3Al2(SiO3)6) with Cr/V impurities) — mineral

Raw Emerald

Beryl (Be3Al2(SiO3)6) with Cr/V impurities

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Aquamarine (Beryl (Be3Al2Si6O18 with Fe2+ trace elements)) — Mineral

Aquamarine

Beryl (Be3Al2Si6O18 with Fe2+ trace elements)

Raw Emerald (Beryl (Be3Al2Si6O18 with Chromium/Vanadium)) — mineral

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium)

Peridot (rough olivine crystals) (Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot) — mineral

Peridot (rough olivine crystals)

Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot

Quartz crystal fragment in weathered host rock (Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix) — mineral

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Diamond (likely rough or included fragment) (Diamond, crystalline carbon (C), cubic crystal system) — gemstone

Diamond (likely rough or included fragment)

Diamond, crystalline carbon (C), cubic crystal system

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

White Quartz Crystal Cluster

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)

Desert Rose (Baryte or Gypsum variation (CaSO4·2H2O or BaSO4)) — mineral

Desert Rose

Baryte or Gypsum variation (CaSO4·2H2O or BaSO4)

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

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz-lined vesicle in basalt (amygdaloidal basalt) (Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides) — igneous

Quartz-lined vesicle in basalt (amygdaloidal basalt)

Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides

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

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or iron-stained quartz

Carnelian Agate (Tumbled) (Chalcedony (SiO2)) — mineral

Carnelian Agate (Tumbled)

Chalcedony (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Epidote in Quartz (SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)) — mineral

Epidote in Quartz

SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)

Calcite (or Alabaster, if truly carved) (Calcium Carbonate (CaCO3)) — Mineral/Rock

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Green Aventurine (SiO2) — mineral

Green Aventurine

SiO2

Ocean Jasper (SiO2) — mineral

Ocean Jasper

SiO2