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

Chevron Amethyst (Silicon Dioxide (SiO2) with iron impurities and white quartz bands) — mineral

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities and white quartz bands

Graphite (Graphite (C)) — mineral

Graphite

Graphite (C)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

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

Labradorite (Feldspar)

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

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Aragonite Star Cluster (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite Star Cluster

Aragonite (Calcium Carbonate, CaCO3)

Dendritic Limestone (Calcite with Manganese Oxide (Manganese Dendrites)) — sedimentary

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Diamond (Colorless/White) (Carbon (C)) — mineral

Diamond (Colorless/White)

Carbon (C)

Graphic Granite (Graphic Granite (Granitic Pegmatite), typically KAlSi3O8 (Feldspar) + SiO2 (Quartz)) — igneous

Graphic Granite

Graphic Granite (Granitic Pegmatite), typically KAlSi3O8 (Feldspar) + SiO2 (Quartz)

Blue Aragonite (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurities)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Orange Calcite with Siderite/Iron Oxide Coating (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Picture Jasper (SiO2) — mineral

Picture Jasper

SiO2

Quartz on Sandstone (Silicon Dioxide (SiO2) in Lithic Sandstone) — sedimentary

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Blue Topaz (Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2) — gemstone

Blue Topaz

Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2

Calcite on Limestone (or Fossil) (Calcium Carbonate (CaCO3)) — sedimentary

Calcite on Limestone (or Fossil)

Calcium Carbonate (CaCO3)

Snowflake Obsidian (Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Limonite (Iron Ore) (Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Yellow Jade (Nephrite or Jadeite) (Nephrite: Ca2(Mg, Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6) — metamorphic

Yellow Jade (Nephrite or Jadeite)

Nephrite: Ca2(Mg, Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Limonite pseudomorph after Pyrite (Goethite/Limonite FeO(OH)·nH2O) — mineral

Limonite pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O

Raw Diamond (Rough Uncut) (Diamond (C - pure carbon)) — mineral

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 + impurities)

Limonite/Goethite Nodule (Iron Oxyhydroxide (primarily FeO(OH)·nH2O)) — mineral

Limonite/Goethite Nodule

Iron Oxyhydroxide (primarily FeO(OH)·nH2O)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Epidote (Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) — metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Obsidian (Black Obsidian) (Amorphous volcanic glass (primarily SiO2)) — igneous

Obsidian (Black Obsidian)

Amorphous volcanic glass (primarily SiO2)

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

Milky Quartz Fragment

Silicon Dioxide (SiO2)

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

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Amber (Succinite (Fossilized Tree Resin)) — mineraloid

Amber

Succinite (Fossilized Tree Resin)

Peridot (Olivine (Mg, Fe)2SiO4) — Mineral

Peridot

Olivine (Mg, Fe)2SiO4

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Quartz (Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Ferruginous Quartz (Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions) — mineral

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions

Schist (Mica Schist (Metamorphic Rock)) — metamorphic

Schist

Mica Schist (Metamorphic Rock)