Rock Identifier

Category

Igneous Or Sedimentary (Anthropogenic Modification)

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

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

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

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

Basalt

Basalt (containing mainly Plagioclase feldspar and Pyroxene)

Basalt (Basalt) — igneous

Basalt

Basalt

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Scoria (Lava Rock) (Scoriaceous Basalt) — igneous

Scoria (Lava Rock)

Scoriaceous Basalt

Basalt with Epidote Veining (Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)) — igneous

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

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

Granite

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

Amygdaloidal Basalt (Amygdaloidal Basalt (with secondary mineral infilling)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (with secondary mineral infilling)

Basalt (River Rock Cobble) (Extrusive mafic volcanic rock (Basalt)) — igneous

Basalt (River Rock Cobble)

Extrusive mafic volcanic rock (Basalt)

Obsidian (Volcanic glass (Mainly SiO2)) — igneous

Obsidian

Volcanic glass (Mainly SiO2)

Basalt with Porphyritic Texture (Porphyritic Basalt) — igneous

Basalt with Porphyritic Texture

Porphyritic Basalt

Scoria (Vesicular Basaltic Glass) — igneous

Scoria

Vesicular Basaltic Glass

Granite (Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica K(Mg,Fe)3AlSi3O10(OH)2)) — igneous

Granite

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica K(Mg,Fe)3AlSi3O10(OH)2)

Porphyritic Basalt (Porphyritic Basalt (with Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase phenocrysts)

Scoria (Lava Rock) (Mafic Vesicular Volcanic Rock) — igneous

Scoria (Lava Rock)

Mafic Vesicular Volcanic Rock

Obsidian with Mahogany Phasing (Volcanic Glass (SiO2 + Fe2O3)) — igneous

Obsidian with Mahogany Phasing

Volcanic Glass (SiO2 + Fe2O3)

Granite (Felsic Plutonic Rock (Granite)) — igneous

Granite

Felsic Plutonic Rock (Granite)

Coarse-grained Granite (Quartz and Feldspar dominated) (Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)) — Igneous

Coarse-grained Granite (Quartz and Feldspar dominated)

Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)

Granite (Granite (Felsic Plutonic Rock)) — Igneous

Granite

Granite (Felsic Plutonic Rock)

Granite (Granite) — igneous

Granite

Granite

Peridotite (Ultramafic intrusive rock (Peridotite)) — Igneous

Peridotite

Ultramafic intrusive rock (Peridotite)

Granite Pebble (Granite (Phaneritic Quartz-Feldspar Rock)) — igneous

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Obsidian (Amorphous volcanic glass (SiO2)) — igneous

Obsidian

Amorphous volcanic glass (SiO2)

Vesicular Basalt (Basalt with secondary mineral infilling (Amygdaloidal Basalt)) — igneous

Vesicular Basalt

Basalt with secondary mineral infilling (Amygdaloidal Basalt)

Granite (Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)) — igneous

Granite

Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron) (Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)) — igneous

Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)

Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)

Basalt (Basalt) — igneous

Basalt

Basalt

Labradorite (Larvikite variety) (Plagioclase Feldspar (Na,Ca)(Si,Al)4O8) — igneous

Labradorite (Larvikite variety)

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

Vesicular Basalt (Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)) — igneous

Vesicular Basalt

Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)

Iron-Nickel Meteorite (Siderite (Iron Meteorite), primarily Fe-Ni alloy) — igneous

Iron-Nickel Meteorite

Siderite (Iron Meteorite), primarily Fe-Ni alloy

Diorite (Diorite (Intermediate Plutonic Rock)) — igneous

Diorite

Diorite (Intermediate Plutonic Rock)

Granodiorite (Phaneritic Plutonic Rock - Granodiorite) — igneous

Granodiorite

Phaneritic Plutonic Rock - Granodiorite

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

Diabase

Diabase (also known as Dolerite)

Porphyritic Basalt (Porphyritic Basalt (with plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (with plagioclase phenocrysts)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Iron Meteorite (likely Chondrite or weathered Iron-Nickel) (Meteorite (Fe-Ni alloy & silicates)) — igneous

Iron Meteorite (likely Chondrite or weathered Iron-Nickel)

Meteorite (Fe-Ni alloy & silicates)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Basalt (Basalt) — igneous

Basalt

Basalt

Pumice (Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)) — Igneous

Pumice

Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)

Diorite (Salt and Pepper Rock) (Diorite) — igneous

Diorite (Salt and Pepper Rock)

Diorite

Basalt with Vesicular Texture (Basalt (SiO2 range 45-52%)) — igneous

Basalt with Vesicular Texture

Basalt (SiO2 range 45-52%)