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

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Crystalline fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

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

Rose Quartz and Milky Quartz

Silicon Dioxide (SiO2)

Calcite Geode (Calcium Carbonate (CaCO3)) — mineral

Calcite Geode

Calcium Carbonate (CaCO3)

Opalite (Synthetic Opalized Glass) — mineraloid (man-made)

Opalite

Synthetic Opalized Glass

mineraloid (man-made)

Granite Water-Worn Pebble (Felsic intrusive igneous rock (Granite)) — igneous

Granite Water-Worn Pebble

Felsic intrusive igneous rock (Granite)

Optical Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz (Milky/Rose variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Feldspathic Granite (likely Syenite or Granite Pegmatite) (Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)) — igneous

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

Gabbro (Gabbro) — igneous

Gabbro

Gabbro

Chalcedony (Quartz Var.) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

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

Granite (Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)) — igneous

Granite

Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Olivine in Basalt (Peridotite Xenolith) (Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt) — igneous

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

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

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Granite Pebble (Felsic intrusive igneous rock) — igneous

Granite Pebble

Felsic intrusive igneous rock

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartz (Quartzite) (Silicon Dioxide (SiO2)) — metamorphic

Quartz (Quartzite)

Silicon Dioxide (SiO2)

Quartz Geode (Crystalline Silicon Dioxide (SiO2) within a nodule) — sedimentary

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Chalcedony (Common Opal variant or Quartz) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

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

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Granite (Felsic Plutonic Rock (primarily SiO2)) — igneous

Granite

Felsic Plutonic Rock (primarily SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst (Tumbled Chips) (Amethyst (Silicon Dioxide with Iron impurities, SiO2)) — mineral

Amethyst (Tumbled Chips)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Dyed Crackle Quartz (Green) (Quenching-treated Quartz (Silicon Dioxide, SiO2)) — mineral

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Shale with Pyrite (Clastic sedimentary rock containing Iron Disulfide (FeS2)) — sedimentary

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Opalite (Man-made Glass (SiO2 + additives)) — mineraloid (synthetic)

Opalite

Man-made Glass (SiO2 + additives)

mineraloid (synthetic)

Slate with Pyrite Inclusions (Foliated Metamorphic Rock (with Iron Sulfide FE-S2)) — metamorphic

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Olivine (Peridot) (Magnesium Iron Silicate (Mg, Fe)2SiO4) — mineral

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Native Sulfur (Sulfur (S8)) — mineral

Native Sulfur

Sulfur (S8)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Staurolite (Fairy Stone) (Staurolite (Fe2+2Al9Si4O23(OH))) — metamorphic

Staurolite (Fairy Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Porphyry (Porphyritic Andesite/Rhyolite) — igneous

Porphyry

Porphyritic Andesite/Rhyolite

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)