Man Made Material, Not A Natural Rock Or Mineral Specimen

Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.

Yellow Quartz (Iron-stained Quartz)

Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities

mineral

Rhyolite

Rhyolite (felsic volcanic rock)

igneous

Quartzite

Quartzite (SiO2)

metamorphic

Sunstone and Green Aventurine

Sunstone: (Ca,Na)[(Al,Si)2Si2O8] (Plagioclase Feldspar Group); Green Aventurine: SiO2 (Quartz)

Mineral

Puddingstone

Conglomerate

Sedimentary

Gold Nugget

Native Gold (Au)

mineral

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Sedimentary rock (specifically a concretion or possibly a geode)

Moonstone

Orthoclase Feldspar (formula: (K,Na)AlSi3O8)

mineral

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

sedimentary (anthropogenic/technogenic)

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

sedimentary

Pumice

Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)

igneous

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Geode (Unopened)

Siliceous Septarian Concretion / Geode (SiO2)

sedimentary

Basalt

Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)

igneous

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)

sedimentary

Puddingstone (Conglomerate)

Conglomerate (clastic sedimentary rock)

sedimentary

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)

mineral

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe-oxides)

metamorphic

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Sedimentary

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

mineral

Sunstone

Aventurine Feldspar (Plagioclase Feldspar with inclusions)

mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Chert / Jasper

Microcrystalline Quartz (SiO2)

sedimentary

Biotite Mica

K(Mg,Fe)3AlSi3O10(OH)2

Mineral in a matrix (likely quartz or feldspar)

Basalt (Vesicular/Scoria)

Vesicular Basalt

igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Conglomerate with Native Copper

Clastic Sedimentary Rock with Native Copper (Cu)

sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Pebble (river rock/beach pebble)

Pebble (clast size class)

Sedimentary Rock

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary

Quartzite

Quartzite (primarily SiO2)

metamorphic

Agate

Agate (Cryptocrystalline Variety of Quartz, SiO2)

Mineral

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Mineral

Diorite (Salt and Pepper Rock)

Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)

igneous

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

metamorphic

Gold Nugget

Native Gold (Au)

mineral

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

sedimentary

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

mineral