Pyrite on Quartz (Fool's Gold in Quartz)
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Kimberlite
Kimberlite
igneous
Banded Agate (Tumbled)
Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)
mineral
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Yellow Quartzite (River Pebble)
Silicon Dioxide (Metamorphosed Sandstone), SiO2
metamorphic
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Rutilated Quartz
SiO2 with TiO2 inclusions (Quartz with Rutile)
mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Chert (Tripolitic Chert / Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Black Sapphire
Corundum (Al2O3 with inclusions of hematite or ilmenite)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Rough Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartzite Pebble
Quartzite (Silicon Dioxide: SiO2)
metamorphic
Jasper (specifically Red Jasper or Iron-stained Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Basalt with Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Schist
Mica Schist
metamorphic
Pink Chalcedony (Agate/Jasper blend)
Silicon Dioxide (SiO₂)
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Botryoidal Chalcedony (Desert Rose / Grape Agate variant)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Smoky Quartz (Tumbled)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Larimar
Pectolite (a blue variety of Pectolite)
Mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Ruby (Corundum)
Al2O3 (Aluminium oxide with Chromium impurities)
Mineral