Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.

Granite

Granite (a common name for a felsic intrusive igneous rock)

Igneous Rock

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

Mineral

Banded Gneiss

Gneiss

Metamorphic

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Mineral

Green Calcite

Calcite (CaCO3)

mineral

Amethyst Geode

Silicon Dioxide (SiO2) with trace Iron (Fe3+) impurities

mineral

Thunderegg (Agate-filled Geode Node)

Silicon dioxide (SiO2) with various inclusions

sedimentary/igneous association

Agate

Chalcedony (cryptocrystalline quartz)

Mineral

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

igneous or sedimentary (anthropogenic modification)

Citrine Geode (or Druzy Citrine)

Silicon Dioxide (SiO₂) - a variety of Quartz

Mineral

Pyrite

Pyrite (FeS2)

Mineral

Schist

N/A (a rock type, not a mineral formula)

metamorphic

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Mineral

Citrine

SiO2 (Silicon Dioxide)

Mineral

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

metamorphic

Chalcopyrite

Chalcopyrite (CuFeS2)

Mineral

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Mineral

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Igneous

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

Mineral

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

igneous

Hematite (beads)

Hematite (Fe₂O₃)

Mineral

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Metamorphic Rock

Kunzite

Spodumene (LiAlSi2O6), variety Kunzite

Mineral

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

igneous

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

mineral

Gold

Gold (Au)

Mineral

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Mineral, specifically a Cryptocrystalline Quartz variety

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Mineral

Pumice (likely)

Pumice (extrusive igneous rock)

Igneous

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Metamorphic Rock

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock