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 or druzy quartz specimen (Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock) — mineral

Quartz geode or druzy quartz specimen

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Smoky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

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

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Quartz crystal cluster in iron-stained matrix (Quartz (SiO₂), likely a drusy or small-vein crystal coating; exact host rock is unclear from the photo) — mineral

Quartz crystal cluster in iron-stained matrix

Quartz (SiO₂), likely a drusy or small-vein crystal coating; exact host rock is unclear from the photo

Blue sapphire (rough corundum) (Corundum, Al₂O₃; blue color commonly from trace iron and titanium) — gemstone

Blue sapphire (rough corundum)

Corundum, Al₂O₃; blue color commonly from trace iron and titanium

Calcite crystal cluster (Calcite (CaCO₃)) — mineral

Calcite crystal cluster

Calcite (CaCO₃)

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

Calcite crystal cluster

Calcite — calcium carbonate, CaCO₃

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

Selenite (gypsum) crystal

Gypsum, CaSO₄·2H₂O; transparent/white variety called selenite

Polished agate pebble (Banded chalcedony, a microcrystalline variety of quartz (SiO₂)) — mineral

Polished agate pebble

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

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

Quartz Crystal Point

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Bismuth (Native Bismuth (Bi)) — mineral

Bismuth

Native Bismuth (Bi)

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

Clear quartz crystal/chunk

Quartz (silicon dioxide, SiO₂)

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

Tumbled quartz crystal fragment

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

Faceted Quartz (Rock Crystal) (Crystalline Silicon Dioxide (SiO2)) — gemstone

Faceted Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

Quartz Crystal Cluster / Quartzite (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

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

Rock Crystal Quartz Bead

Silicon Dioxide (SiO2)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Milky Quartz (Druzy Coating) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Druzy Coating)

Silicon Dioxide (SiO2)

Rutilated Quartz (Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions) — mineral

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

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)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

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

Blue Quartz

Silicon Dioxide (SiO2) with microscopic inclusions

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)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Crazy Lace Agate (Chalcedony (SiO2)) — Mineral

Crazy Lace Agate

Chalcedony (SiO2)

Pyrite Concretion (Iron Sulfide (FeS2) in Sedimentary Matrix) — sedimentary

Pyrite Concretion

Iron Sulfide (FeS2) in Sedimentary Matrix

Yellow calcite (likely honey calcite) (Calcite, CaCO₃) — mineral

Yellow calcite (likely honey calcite)

Calcite, CaCO₃

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz in Matrix (Silicon Dioxide (SiO2) in host rock matrix) — mineral

Quartz in Matrix

Silicon Dioxide (SiO2) in host rock matrix

Quartzite with Quartz Crystal Vug (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite with Quartz Crystal Vug

Metamorphic Quartzite (SiO2)

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

Galena

Lead(II) sulfide (PbS)

Colorless quartz crystal (likely rough rock crystal) (Quartz, silicon dioxide (SiO₂)) — mineral

Colorless quartz crystal (likely rough rock crystal)

Quartz, silicon dioxide (SiO₂)

Pink feldspar crystal (Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈) — mineral

Pink feldspar crystal

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈

Yellow fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Yellow fluorite crystal

Fluorite (calcium fluoride, CaF₂)