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 (Milky/Crystalline variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Gabbro (Gabbro (Coarse-grained mafic intrusive igneous rock)) — igneous

Gabbro

Gabbro (Coarse-grained mafic intrusive igneous rock)

Smoky Quartz with Feldspar (SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)) — mineral

Smoky Quartz with Feldspar

SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)

Granite Water-Worn Pebble (Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)) — igneous

Granite Water-Worn Pebble

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Quartz Drusy (on Geode Fragment) (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Drusy (on Geode Fragment)

Crystalline Silicon Dioxide (SiO2)

Tumbled Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Tumbled Agate

Cryptocrystalline Quartz (SiO2)

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

Hematite

Iron(III) oxide (Fe2O3)

Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Rose Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Yellow Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Golden Healer Quartz (Ferruginous Quartz (SiO2 with Fe2O3 inclusions)) — mineral

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Green Apophyllite (Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O) — mineral

Green Apophyllite

Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O

Yellow Quartz (Citrine or Yellow Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Yellow Chalcedony)

Silicon Dioxide (SiO2)

Eclogite (Eclogite (Pyrope garnet and Omphacite pyroxene)) — metamorphic

Eclogite

Eclogite (Pyrope garnet and Omphacite pyroxene)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Quartz Drusy on Matrix

Silicon Dioxide (SiO2)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — mineral

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Marble (polished) (Recrystallized Calcite (CaCO3)) — metamorphic

Marble (polished)

Recrystallized Calcite (CaCO3)

Granite (Granite (Phaneritic Quartz-Feldspar Rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar Rock)

Quartz Geode (partially opened) (Silicon Dioxide (SiO2) with iron staining) — mineral

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

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

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

Aragonite (Aragonite (Calcium Carbonate - CaCO3)) — mineral

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Diabase (Greenstone) (Diabase (also known as Dolerite)) — igneous

Diabase (Greenstone)

Diabase (also known as Dolerite)

Serpentinite (Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

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

Quartz (Druzy)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase) (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Granite (Dioritic or Hornblende-rich) (Phaneritic Plutonic Felsic to Intermediate Igneous Rock) — igneous

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

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

Milky Quartz Chip

Silicon Dioxide (SiO2)

Magnetite / Iron Ore (Magnetite (Fe3O4)) — mineral

Magnetite / Iron Ore

Magnetite (Fe3O4)

Specularite in Quartz (Specular Hematite (Fe2O3) in Quartz (SiO2)) — mineral

Specularite in Quartz

Specular Hematite (Fe2O3) in Quartz (SiO2)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Graphic Granite (Runic Granite) (Pegmatite (Graphic Granite variety)) — igneous

Graphic Granite (Runic Granite)

Pegmatite (Graphic Granite variety)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Synthetic or Man-made Glass Imitation) (Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic) — mineral

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)