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 Crystal Point (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Point

Silicon Dioxide (SiO2)

Granite Pegmatite (Phaneritic Plutonic Igneous Rock) — igneous

Granite Pegmatite

Phaneritic Plutonic Igneous Rock

Amethyst (Rough Crystal) (Silicon Dioxide (SiO2 with ferric iron impurities)) — mineral

Amethyst (Rough Crystal)

Silicon Dioxide (SiO2 with ferric iron impurities)

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

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

Quartz Crystal Point

Silicon Dioxide (SiO2)

Obsidian (Obsidian (principally SiO2)) — igneous

Obsidian

Obsidian (principally SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst (Quartz (SiO2) with iron impurities) — mineral

Amethyst

Quartz (SiO2) with iron impurities

Aragonite crystal cluster (Aragonite, orthorhombic CaCO₃) — mineral

Aragonite crystal cluster

Aragonite, orthorhombic CaCO₃

Man-made Crystal (Lead Glass) (Lead oxide-doped Silica Glass (approx. SiO2 + PbO)) — Mineraloid/Synthetic Material

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Mineraloid/Synthetic Material

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

Small quartz crystal fragment

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

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

Quartz Crystal (Geode Fragment)

Silicon Dioxide (SiO2)

Quartz Crystal (Citrine / Golden Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal (Citrine / Golden Quartz)

Silicon Dioxide (SiO2)

Tiny amber-colored crystal fragment (Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral) — mineral

Tiny amber-colored crystal fragment

Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral

Quartz crystal fragment (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

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

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

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

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Polished blue chalcedony (likely blue agate) (Cryptocrystalline quartz, SiO₂; chalcedony variety) — gemstone

Polished blue chalcedony (likely blue agate)

Cryptocrystalline quartz, SiO₂; chalcedony variety

Tumbled Rose Quartz (Quartz (SiO2)) — mineral

Tumbled Rose Quartz

Quartz (SiO2)

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

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Ferruginous Quartz (Quartz (Silicon Dioxide) with Iron Inclusion (SiO2 + Fe2O3)) — mineral

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion (SiO2 + Fe2O3)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst (Silicon dioxide (Quartz variety), SiO2) — mineral

Amethyst

Silicon dioxide (Quartz variety), SiO2

Small transparent crystal fragment, possibly quartz (Quartz (SiO₂), tentative identification) — mineral

Small transparent crystal fragment, possibly quartz

Quartz (SiO₂), tentative identification

Schist with Schorl (Black Tourmaline) (NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — metamorphic

Schist with Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Silicon dioxide (SiO2)) — mineral

Quartz

Silicon dioxide (SiO2)

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Quartz with Tourmaline or Amphibole (Silicon Dioxide with silicate inclusions (SiO2)) — mineral

Quartz with Tourmaline or Amphibole

Silicon Dioxide with silicate inclusions (SiO2)

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

Aura Quartz (Titanium/Gold coated) (Silicon Dioxide (SiO2) with metallic vapor deposition) — mineral

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Hemimorphite (Hemimorphite (Zn4Si2O7(OH)2·H2O)) — mineral

Hemimorphite

Hemimorphite (Zn4Si2O7(OH)2·H2O)

Pegmatite or Graphic Granite (Intrusive Igneous Rock) — igneous

Pegmatite or Graphic Granite

Intrusive Igneous Rock

Celestine (or Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Strawberry Quartz (Quartz with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Yellow calcite crystal cluster with calcite fragment (Calcite, calcium carbonate (CaCO₃)) — mineral

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Hemimorphite on Limonite Gossan (Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix) — mineral

Hemimorphite on Limonite Gossan

Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix

Celestine (Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (Celestite)

Strontium sulfate (SrSO4)

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

Quartz (Milky Quartz / Quartz Crystal)

Silicon Dioxide (SiO2)