Not A Rock (Man Made Origin)

Browse not a rock (man made origin) specimens identified by the Rock Identifier community.

Nephrite Jade

Nephrite

Mineral/Rock

Green Tourmaline (Verdelite)

Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)

Mineral

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

sedimentary

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Mineral

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Man-made material (Anthro-lithic product)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Mineral

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Mineral (or mineraloid if microcrystalline)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Rock (likely Sedimentary)

Basalt Cobble

Vesicular Basalt (Mafic Extrusive)

igneous

Granodiorite

igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

igneous

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

metamorphic

Vesicular Basalt (Pumice-like)

Vesicular Basalt

igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

igneous

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

igneous

Basalt (Vesicular)

Basalt (Extrusive Volcanic Rock)

igneous

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

igneous

Basalt with Scoria

Amygdaloidal Basalt / Vesicular Basalt

igneous

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Mineral, Jewelry

Quartz

Silicon Dioxide (SiO2)

Mineral

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

metamorphic

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

metamorphic

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Basalt

Basalt (Mafic volcanic rock)

igneous

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

sedimentary

Basalt

Extrusive mafic igneous rock

igneous

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

sedimentary

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

igneous

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

sedimentary

Sandstone

Quartz Sandstone (predominantly)

Sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Basalt

Basalt (Mafic Extrusive)

igneous

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

sedimentary

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

mineral

Shale or Slaty Mudstone

Argillaceous sedimentary rock

sedimentary

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

metamorphic

Sandstone

Arenite (SiO2 dominant)

sedimentary

Garnet Schist

Garnetiferous Micaceous Schist

metamorphic