Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Category
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.
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Pyrite on Quartz (Fool's Gold in Quartz)
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Quartz (Iron-stained or Ferruginous)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Banded Agate (Tumbled)
Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Gneiss
High-grade regional metamorphic Gneiss
metamorphic
Epidote in Quartz
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Likely obsidian (black volcanic glass)
Obsidian; predominantly rhyolitic volcanic glass, often ~70–75% SiO₂
igneous
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
metamorphic
Bixbyite on Rhyolite
Bixbyite (Mn2+,Fe3+)2O3
mineral
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz pebble with iron inclusion
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Gneiss
Gneiss
metamorphic
Ruby
Corundum (Al2O3)
gemstone
Coal (Anthracite/Bituminous)
Carbo fossilium (primarily Carbon)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Raw Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Citrine or Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenstone / Metabasalt
Chlorite schist or Epidiorite
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Greenstone (Epidosite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) or Chlorite)
metamorphic