Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Category
Man Made Alloy (Metallic)
Browse man made alloy (metallic) specimens identified by the Rock Identifier community.
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
Igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Muscovite Schist
Muscovite (KAl2(AlSi3O10)(OH)2) in Schist
metamorphic
Micaceous Sandstone or Quartzite
Sandstone (lithified quartz grains, often with mica) or Quartzite (metamorphosed sandstone)
Sedimentary or Metamorphic
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Schist
Mica Schist
metamorphic
Basalt Pebble
Basalt (Extrusive Mafic Igneous)
igneous
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Schist
Mica Schist
metamorphic
Ferruginous Sandstone with Ironstone Concretion
Goethite-rich Sandstone (FeO(OH))
sedimentary
Schist
Mica Schist (Variable chemistry, often rich in muscovite and biotite)
metamorphic
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt (Road Aggregate / Crushed Stone)
Aphanitic Mafic Igneous Rock
igneous
Basalt (River Stone)
Basalt
igneous
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Basalt
Basalt
igneous
Scoria (with Iron Oxidation)
Vesicular Basalt / Scoria
igneous
Gold Nugget
Native Gold (Au)
mineral
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Chondrite Meteorite
Stony Meteorite (Chondrite)
igneous
Rhodochrosite with Pyrite and Quartz
Manganese Carbonate (MnCO3)
mineral
Schist (with Iron Oxide)
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Magnetite (potentially as a Lodestone or within Ironstone)
Magnetite (Fe3O4)
mineral
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Sunstone
Oligoclase (Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8 with Hematite or Copper inclusions
mineral
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Rutilated Quartz
Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)
Mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Scoria (Vesicular Basalt)
Scoria (Vesicular Igneous Rock)
igneous
Micaceous Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic