Rock Identifier

Category

Igneous Or Metamorphic

Browse igneous or metamorphic specimens identified by the Rock Identifier community.

Learn about Igneous Or Metamorphic in the encyclopedia

Carbonatite

Cordierite Hornfels

Cordierite Hornfels

Metabasalt

Eulysite

Migmatite

Anthracite

Metaquartzite

Slate

Marble

Hornfels

Metarhyolite

Metagabbro

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Likely milky quartz or white calcite (Quartz (SiO₂) or calcite (CaCO₃); identification is limited by the photograph) — mineral

Likely milky quartz or white calcite

Quartz (SiO₂) or calcite (CaCO₃); identification is limited by the photograph

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely weathered quartz-bearing rock fragment (Indeterminate; possibly granitic or metamorphic quartz–feldspar aggregate) — igneous

Likely weathered quartz-bearing rock fragment

Indeterminate; possibly granitic or metamorphic quartz–feldspar aggregate

Quartz with inclusions (likely Tourmaline or Biotite) (Silicon Dioxide (SiO2)) — mineral

Quartz with inclusions (likely Tourmaline or Biotite)

Silicon Dioxide (SiO2)

Quartz Pebble (Crystalline Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Tumbled pale-green quartz, likely aventurine or common quartz (Quartz (SiO₂), possibly green aventurine containing fuchsite inclusions) — mineral

Tumbled pale-green quartz, likely aventurine or common quartz

Quartz (SiO₂), possibly green aventurine containing fuchsite inclusions

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

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Quartz (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Weathered quartz-rich rock fragment (Likely quartz-bearing feldspathic fragment; exact identification requires testing) — mineral

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic fragment; exact identification requires testing

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

Amethyst

Quartz (SiO2) with iron impurities

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

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Orthoclase Feldspar (or K-Feldspar) (Orthoclase (KAlSi3O8)) — Mineral

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

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

Amethyst

Quartz (SiO2) with iron impurities

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Black Sand (Magnetite Sand) (Magnetite-rich Placers (Fe3O4)) — sedimentary

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Magnetite or Hematite-rich Ore (Magnetite (Fe3O4) or Hematite (Fe2O3)) — mineral

Magnetite or Hematite-rich Ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

Quartz pebble (likely milky quartz) (Quartz, SiO₂) — mineral

Quartz pebble (likely milky quartz)

Quartz, SiO₂

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

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded quartz-rich beach pebble (Likely milky quartz or quartzite (SiO₂)) — mineral

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

Sandstone (Arkose) (Arkose Sandstone (SiO2 with KAlSi3O8)) — sedimentary

Sandstone (Arkose)

Arkose Sandstone (SiO2 with KAlSi3O8)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Magnetite (likely in Hematite or Ironstone) (Magnetite (Fe3O4)) — mineral

Magnetite (likely in Hematite or Ironstone)

Magnetite (Fe3O4)

Quartz-rich pebble, likely milky quartz (Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or feldspar impurities) — mineral

Quartz-rich pebble, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or feldspar impurities

Milky quartz fragment (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Citrine (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Citrine

Silicon Dioxide (SiO2) with Fe3+ impurities

Sand Grain (Silica/Quartz Grain) (Silicon Dioxide (SiO2)) — sedimentary

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained Quartz) (Silicon Dioxide (SiO2) with Hematite/Limonite inclusion) — mineral

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusion

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

Amethyst (Tumbled)

Amethyst (SiO2 with iron impurities)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Orange Quartz (Citrine Quartz) (Silicon Dioxide (SiO2)) — mineral

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Rough Citrine Quartz (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Likely dyed pink quartz or agate fragment (Quartz, SiO₂ (identity uncertain from the image)) — mineral

Likely dyed pink quartz or agate fragment

Quartz, SiO₂ (identity uncertain from the image)

Milky quartz fragment (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Amethyst crystal

Silicon Dioxide (SiO2) with iron impurities

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz and Citrine (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz and Citrine

Silicon Dioxide (SiO2)