Rock Identifier

Category

Igneous Rock

Browse igneous rock specimens identified by the Rock Identifier community.

Banded Gneiss (Gneiss (complex metamorphic silicate rock)) — metamorphic

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Pumice (Vesicular volcanic glass) — igneous

Pumice

Vesicular volcanic glass

Basalt with Scoria/Vesicular texture (Vesicular Basalt (primarily Plagioclase feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Scoria/Vesicular texture

Vesicular Basalt (primarily Plagioclase feldspar, Pyroxene, and Olivine)

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

Diabase (also known as Dolerite)

Diabase

Granite (Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Pumice (Pumice (Vesicular Felsic Glass)) — igneous

Pumice

Pumice (Vesicular Felsic Glass)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

Granitic Gneiss (Gneiss (Metamorphic rock of granitic composition)) — metamorphic

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Metagabbro / Epidote Gneiss (Epidote bearing Hornblende Gneiss) — metamorphic

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Basalt (Basalt (composition predominately Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Obsidian (Volcanic Glass (SiO2, usually 70% or more)) — igneous

Obsidian

Volcanic Glass (SiO2, usually 70% or more)

Basalt (Basalt (Mainly Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (Mainly Plagioclase Feldspar and Pyroxene)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic Volcanic Rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basalt or Porphyritic Andesite) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt or Porphyritic Andesite

Quartz (Druzy) in host rock (SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)) — Mineral

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Diamond in Kimberlite (Diamond (C in Kimberlite Matrix)) — igneous

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Emerald in Matrix (Quartz/Schist) (Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

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

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Gneiss (Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)) — metamorphic

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Amygdaloidal Basalt (Amygdaloidal Mafic Volcanic Rock (Basalt)) — igneous

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock (Basalt)

Basalt with Epidote/Chlorite (Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))) — igneous

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Porphyritic Andesite (Porphyritic Andesite (Intermediate Volcanic Rock)) — igneous

Porphyritic Andesite

Porphyritic Andesite (Intermediate Volcanic Rock)

Blue Apatite (Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]) — mineral

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Feldspar (specifically Orthoclase) (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

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

Rough Amethyst

Silicon Dioxide (SiO2) with Iron impurities

White Agate (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz (specifically Milky or Clear Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (with Mica or Iron staining) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Rhyolitic Tuff (Breccia Type) (Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)) — igneous

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)