Rock Identifier

Category

Basalt

Browse basalt specimens identified by the Rock Identifier community.

Learn about Basalt in the encyclopedia

Basalt

Basalt

Tholeiitic Basalt

Tholeiitic Basalt

Metabasalt

Metabasalt

Variolite

Variolite

Tachylite

Tachylite

Gabbro

Gabbro

Sideromelane

Sideromelane

Palagonite

Palagonite

Diabase

Diabase

Greenstone

Greenstone

Limburgite

Limburgite

Scoria

Scoria

Banded Agate (specifically Chalcedony nodule) (Agate (Silicon Dioxide, SiO2)) — mineral

Banded Agate (specifically Chalcedony nodule)

Agate (Silicon Dioxide, SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Carnelian (Carnelian (a variety of Chalcedony, SiO2)) — mineral

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

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

Amethyst (Quartz)

Silicon Dioxide (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2) with iron oxide impurities) — Mineral

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Banded Agate (Carnelian type) (Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony) — mineral

Banded Agate (Carnelian type)

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Sunstone (Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)) — mineral

Sunstone

Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)

Agate (Banded Chalcedony (SiO2)) — mineral

Agate

Banded Chalcedony (SiO2)

Parti Sapphire (Corundum (Al2O3)) — mineral

Parti Sapphire

Corundum (Al2O3)

Magnetite / Ironstone (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite / Ironstone

Iron(II,III) oxide (Fe3O4)

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

Labradorite

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

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Gabbro (Gabbro (mafic intrusive igneous rock)) — igneous

Gabbro

Gabbro (mafic intrusive igneous rock)

Bauxite (Bauxite (Al2O3·nH2O)) — sedimentary

Bauxite

Bauxite (Al2O3·nH2O)

Greenstone or Chlorite Schist (Greenschist / Chlorite schist) — metamorphic

Greenstone or Chlorite Schist

Greenschist / Chlorite schist

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Amphibolite with Hornblende (Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)) — metamorphic

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

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

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Blue Sapphire (Corundum (Al2O3 with trace Titanium/Iron)) — mineral

Blue Sapphire

Corundum (Al2O3 with trace Titanium/Iron)

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

Labradorite

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

Carnelian (Chalcedony) (Silicon Dioxide (SiO2) with trace Iron Oxide) — mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with trace Iron Oxide

Greenstone (Greenschist-facies basaltic rock) — metamorphic

Greenstone

Greenschist-facies basaltic rock

Amethyst (SiO2 (Silicon Dioxide)) — mineral

Amethyst

SiO2 (Silicon Dioxide)

Olivine (Peridot when gem-quality) (Magnesium Iron Silicate, (Mg,Fe)2SiO4) — Mineral

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate, (Mg,Fe)2SiO4

Granodiorite with Quartz Veining (Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins) — igneous

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Porphyritic Basalt (likely Chinese Writing Stone) (Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix) — igneous

Porphyritic Basalt (likely Chinese Writing Stone)

Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

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

Peridot (Olivine)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Basalt with Quartz/Feldspar Vein (Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein) — igneous

Basalt with Quartz/Feldspar Vein

Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein

Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins) (Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)) — igneous or sedimentary

Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)

Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)

igneous or sedimentary

Basalt with Weathered Rind (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Weathered Rind

Basalt (Aphanitic Mafic Igneous Rock)

Larimar (Pectolite) (NaCa2Si3O8(OH)) — mineral

Larimar (Pectolite)

NaCa2Si3O8(OH)

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

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Quartz Druse (on Chalcedony/Agate base) (Silicon Dioxide (SiO2)) — mineral

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon dioxide (SiO2) with iron impurities

Peridot in Basalt/Xenolith (Olivine (Mg, Fe)2SiO4 in Vesicular Basalt) — igneous

Peridot in Basalt/Xenolith

Olivine (Mg, Fe)2SiO4 in Vesicular Basalt

Basalt with Peridotite Inclusion (Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith) — igneous

Basalt with Peridotite Inclusion

Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Scoria (Red Lava Rock) (Scoria) — igneous

Scoria (Red Lava Rock)

Scoria

Olivine (in Peridotite/Dunite form) (Magnesium Iron Silicate (Mg,Fe)2SiO4) — igneous

Olivine (in Peridotite/Dunite form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Greenstone / Greenschist (Greenschist (metamorphosed mafic rock)) — metamorphic

Greenstone / Greenschist

Greenschist (metamorphosed mafic rock)

Quartz Veined Basalt Pebble (Amygdaloidal Basalt with Quartz (SiO2) veining) — igneous

Quartz Veined Basalt Pebble

Amygdaloidal Basalt with Quartz (SiO2) veining