Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))
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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Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Diamond
Diamond (C)
mineral
Obsidian / Chert (Arrowhead Artifact)
Obsidian (volcanic glass, SiO2 with impurities)
igneous
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Apache Tear (Obsidian)
Hydrated volcanic glass (SiO2 with inclusions)
igneous
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Tektite (Indochinite)
Tektite (impactite), primarily high-silica glass (SiO2)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Zircon
Zircon (Zirconium Silicate - ZrSiO4)
mineral
Diamond (Uncut/Rough)
Carbon (C)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
Mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Apache Tear
Hydrated Obsidians (Volcanic Glass)
igneous
Wavellite
Wavellite (Al3(PO4)2(OH, F)3·5H2O)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Vanadinite
Lead Chlorovanadate - Pb5(VO4)3Cl
mineral
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous