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

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

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Rough Sapphire (Corundum (Al2O3)) — mineral

Rough Sapphire

Corundum (Al2O3)

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

Amethyst Geode

Silicon Dioxide with impurities (SiO2)

Greenstone (Greenstone River Pebble) (Greenschist (metamorphosed mafic igneous rock)) — metamorphic

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

Greenstone (Metabasalt) — metamorphic

Greenstone

Metabasalt

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

Carnelian (Carnelian Agate) (Silicon dioxide (SiO2)) — mineral

Carnelian (Carnelian Agate)

Silicon dioxide (SiO2)

Blue Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

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

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Black Sapphire (Corundum (Al2O3 with inclusions of hematite or ilmenite)) — mineral

Black Sapphire

Corundum (Al2O3 with inclusions of hematite or ilmenite)

Sunstone (Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8) — mineral

Sunstone

Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8

Chalcedony (Carnelian variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Carnelian variety)

Silicon Dioxide (SiO2)

Ruby (Corundum (Al2O3 with Chromium traces)) — mineral

Ruby

Corundum (Al2O3 with Chromium traces)

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

Scoria (Lava Rock) (Scoria) — igneous

Scoria (Lava Rock)

Scoria

Lake Superior Agate (Silicon Dioxide (SiO2)) — mineral

Lake Superior Agate

Silicon Dioxide (SiO2)

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

Amethyst (Purple Quartz)

Silicon Dioxide (SiO2) with iron impurities

Agate (Carnelian/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Carnelian/Chalcedony)

Silicon Dioxide (SiO2)

Lake Superior Agate (Silicon Dioxide (SiO2) with iron impurities) — mineral

Lake Superior Agate

Silicon Dioxide (SiO2) with iron impurities

Banded Agate (Gray Agate) (Silicon Dioxide (SiO2) - Variety of Chalcedony) — mineral

Banded Agate (Gray Agate)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Amethyst Geode (Amethyst (Silicon Dioxide), Formula: SiO2) — mineral

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

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

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Basalt Column Section (Columnar Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt Column Section

Columnar Basalt (Mafic Extrusive Igneous Rock)

Quartz Geode (Quartz (SiO2) within a geode structure) — mineral

Quartz Geode

Quartz (SiO2) within a geode structure

Amethyst (Silicon Dioxide (SiO2) with traces of Iron (Fe3+)) — mineral

Amethyst

Silicon Dioxide (SiO2) with traces of Iron (Fe3+)

Amethyst (Amethyst (Silicon Dioxide SiO2 + Fe4+)) — mineral

Amethyst

Amethyst (Silicon Dioxide SiO2 + Fe4+)

Sunstone (Plagioclase Feldspar (Na,Ca)(Al,Si)4O8) — Mineral

Sunstone

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

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Sunstone (Plagioclase Feldspar (specifically Oligoclase variety with hematite or goethite inclusions)
Chemical Formula: (Ca,Na)(Al,Si)2Si2O8) — Mineral

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety with hematite or goethite inclusions) Chemical Formula: (Ca,Na)(Al,Si)2Si2O8

Heat-Treated Amethyst (Commercial Citrine) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) with iron impurities

Pebble (Likely Basalt or Siltstone) (Clastic sedimentary rock or mafic volcanic rock) — Igneous or Sedimentary

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Igneous or Sedimentary

Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Green Moss Agate / Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions) — sedimentary

Green Moss Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions

Sapphire (Raw/Rough) (Corundum (Al2O3)) — mineral

Sapphire (Raw/Rough)

Corundum (Al2O3)

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

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Agate (Agate (SiO2)) — mineral

Agate

Agate (SiO2)

Banded Agate (specifically Botswana Agate appearance) (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony

Lake Superior Agate (Banded Chalcedony (SiO2)) — mineral

Lake Superior Agate

Banded Chalcedony (SiO2)

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

Diabase (Trap Rock)

Diabase (also known as Dolerite)

Dolerite (Diabase) (Dolerite / Diabase) — igneous

Dolerite (Diabase)

Dolerite / Diabase