Rock Identifier

Category

Igneous (Anthropogenic)

Browse igneous (anthropogenic) specimens identified by the Rock Identifier community.

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — Igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Basalt with Quartz/Calcite matrix (Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix) — igneous

Basalt with Quartz/Calcite matrix

Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix

Snowflake Obsidian (or similar porphyritic volcanic rock) (Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)) — igneous

Snowflake Obsidian (or similar porphyritic volcanic rock)

Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)

Obsidian (Volcanic Glass (Primary component: SiO2)) — igneous

Obsidian

Volcanic Glass (Primary component: SiO2)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Scoria (Basaltic Lava Rock) (Vesicular Basalt) — igneous

Scoria (Basaltic Lava Rock)

Vesicular Basalt

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Pumice (Pumiceous rhyolite / Volcanic glass) — igneous

Pumice

Pumiceous rhyolite / Volcanic glass

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Basalt (containing mainly Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (containing mainly Plagioclase feldspar and Pyroxene)

Wonderstone (Banded Rhyolite) (Rhyolite (Silicon Dioxide with Iron Oxide impurities)) — igneous

Wonderstone (Banded Rhyolite)

Rhyolite (Silicon Dioxide with Iron Oxide impurities)

Scoria (Lava Rock) (Scoriaceous Basalt) — igneous

Scoria (Lava Rock)

Scoriaceous Basalt

Granite (Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)) — igneous

Granite

Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)

Basalt (Road Gravel) (Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)) — igneous

Basalt (Road Gravel)

Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)

Basalt (Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining) (Porphyritic Basalt (Mafic Extrusive)) — igneous

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Pumice (Felsic Volcanic Glass / Vesicular Rhyolite) — Igneous

Pumice

Felsic Volcanic Glass / Vesicular Rhyolite

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Chondrite Meteorite (Stony Meteorite (Chondrite)) — igneous

Chondrite Meteorite

Stony Meteorite (Chondrite)

Porphyritic Andesite (Andesite (Porphyry)) — igneous

Porphyritic Andesite

Andesite (Porphyry)

Obsidian (Apache Tear) (Volcanic Glass (SiO2)) — igneous

Obsidian (Apache Tear)

Volcanic Glass (SiO2)

Lunar Highlands Breccia (Meteorite) (Lunar Feldspathic Breccia) — igneous

Lunar Highlands Breccia (Meteorite)

Lunar Feldspathic Breccia

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and Biotite)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Obsidian (Obsidian (Volcanic Glass; SiO2 content > 70%)) — igneous

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

Granodiorite Pebble (Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)) — igneous

Granodiorite Pebble

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)

Porphyry (Flower Stone) (Porphyry (Andesite or Basalt matrix)) — igneous

Porphyry (Flower Stone)

Porphyry (Andesite or Basalt matrix)

Granite (Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Vesicular Basalt (Amygdaloidal Basalt (Mafic extrusive volcanic rock)) — Igneous

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Basalt (Vesicular or Scoriaceous) (Aphanitic Mafic Volcanic Rock) — igneous

Basalt (Vesicular or Scoriaceous)

Aphanitic Mafic Volcanic Rock

Red Granite (Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)) — igneous

Red Granite

Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)

Quartz with Mica (Pegmatite) (Quartz (SiO2) and Muscovite (KAl2(AlSi3O10)(OH)2)) — igneous

Quartz with Mica (Pegmatite)

Quartz (SiO2) and Muscovite (KAl2(AlSi3O10)(OH)2)

Peridotite (Dunite) (Peridotite (mostly Olivine: (Mg,Fe)2SiO4)) — igneous

Peridotite (Dunite)

Peridotite (mostly Olivine: (Mg,Fe)2SiO4)

Granite Cobble (Granite (Phaneritic Quartz-Feldspar Felsic Rock)) — igneous

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Obsidian (Obsidian (Volcanic Glass)) — Igneous

Obsidian

Obsidian (Volcanic Glass)

Basalt (Basalt) — igneous

Basalt

Basalt

Amygdaloidal Basalt (Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)

Obsidian (Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)) — Igneous

Obsidian

Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)

Pumice (likely weathered/water-worn) (Vesicular volcanic glass) — igneous

Pumice (likely weathered/water-worn)

Vesicular volcanic glass

Granite (Granite (Mainly Quartz, Feldspar, and Mica)) — Igneous

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)