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

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

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Smoky Quartz (Silicon Dioxide (SiO2) with trace aluminum and irradiation) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with trace aluminum and irradiation

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

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

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Sapphire (Rough Corundum) (Corundum (Aluminum Oxide, Al2O3)) — mineral

Sapphire (Rough Corundum)

Corundum (Aluminum Oxide, Al2O3)

Granite with Biotite and Quartz (Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, and K(Mg,Fe)3AlSi3O10(OH)2)) — igneous

Granite with Biotite and Quartz

Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, and K(Mg,Fe)3AlSi3O10(OH)2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Aventurine (Silica (SiO2) with inclusions) — mineral

Yellow Aventurine

Silica (SiO2) with inclusions

Aquamarine and clear quartz (Aquamarine (Be3Al2Si6O18), Quartz (SiO2)) — Mineral

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)

Black Tourmaline (Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4) — mineral

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Vesicular Basalt with Xenocrysts (Mafic Igneous Plutonic/Extrusive Complex) — igneous

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Granite (including Pegmatite variants) (Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)) — Igneous

Granite (including Pegmatite variants)

Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)

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

Kidney Stone (Calcium Oxalate (CaC2O4), Uric Acid, or Struvite) — mineral

Kidney Stone

Calcium Oxalate (CaC2O4), Uric Acid, or Struvite

Green Common Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Green Common Opal

Hydrated Silica (SiO2·nH2O)

Druzy Quartz on Host Rock (Silicon Dioxide (SiO2) with various iron-oxide inclusions) — mineral

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Pyrite (Pyrite (FeS2)) — Mineral

Pyrite

Pyrite (FeS2)

Calcite on Limestone (Calcium Carbonate (CaCO3) on Sedimentary Rock) — mineral

Calcite on Limestone

Calcium Carbonate (CaCO3) on Sedimentary Rock

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Tree Agate (Silicon Dioxide (SiO2) with inclusions of Chlorite or Manganese) — mineral

Tree Agate

Silicon Dioxide (SiO2) with inclusions of Chlorite or Manganese

Tree Agate (Silicon Dioxide (SiO2) with Chlorite inclusions) — mineral

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Aventurine (Green Quartz) (Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Aventurine (Green Quartz)

Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Red Tiger's Eye (Silicified Crocidolite (SiO2 with iron oxide inclusions)) — metamorphic

Red Tiger's Eye

Silicified Crocidolite (SiO2 with iron oxide inclusions)

Milky Quartz (Ferruginous) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Ferruginous)

Silicon Dioxide (SiO2)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Labradorite ((Ca, Na)(Al, Si)4O8) — mineral

Labradorite

(Ca, Na)(Al, Si)4O8

Orange Calcite / Quartzite with Iron Staining (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities) — mineral

Orange Calcite / Quartzite with Iron Staining

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Tiger's Eye (Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz) — metamorphic

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz

Aventurine (Aventurine Quartz (SiO2)) — mineral

Aventurine

Aventurine Quartz (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Carnelian Agate (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide inclusions

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Labradorite (White/Grey Labradorite) (Labradorite: (Ca, Na)(Al, Si)4O8) — mineral

Labradorite (White/Grey Labradorite)

Labradorite: (Ca, Na)(Al, Si)4O8

Green Chalcedony (likely Chrysoprase or dyed Green Agate) (Silicon Dioxide (SiO2) with nickel impurities or chromium/dye) — mineral

Green Chalcedony (likely Chrysoprase or dyed Green Agate)

Silicon Dioxide (SiO2) with nickel impurities or chromium/dye

Yellow Jasper (Chalcedony (Silicon Dioxide, SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2) with iron oxide inclusions

Moonstone (Adularia / Orthoclase (KAlSi3O8)) — mineral

Moonstone

Adularia / Orthoclase (KAlSi3O8)

Moonstone (Orthoclase (KAlSi3O8), specifically the variety showing adularescence) — mineral

Moonstone

Orthoclase (KAlSi3O8), specifically the variety showing adularescence

Blue Crackle Quartz (Dyed Quarzite) (Silicon Dioxide (SiO2) with artificial dye) — Metamorphic (modified)

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Metamorphic (modified)