Granite Pebble
Felsic Plutonic Rock
igneous
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
Coal (Bituminous)
Sedimentary carbonaceous rock
sedimentary
Basalt
Basaltic Mafic Rock
igneous
River Pebble (Greywacke or Siltstone)
Clastic Sedimentary Rock
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Hag Stone
Perforated Sedimentary Rock
sedimentary
Granite (Weathered)
Granitic intrusive rock
igneous
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Gabbro
Plutonic mafic rock
igneous
Basalt
Mafic Igneous Rock
igneous
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Basalt River Stone
Basaltic Igneous Rock
igneous
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Peridotite
Peridotite (Ultramafic Rock)
igneous
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Quartzite with Chlorite
Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Mineral
Basalt (Purple-tinted scoria/vesicular variety)
Extrusive mafic igneous rock (SiO2 range 45–52%)
igneous
Vesicular Basalt (Scoria)
Basalt (Vesicular)
igneous
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Sandstone
Arenite
sedimentary
Gneiss
Gneiss
metamorphic
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Rough Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Basalt
Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)
igneous
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon dioxide (SiO2)
Mineral
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Sugar variety)
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartz
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral