Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
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Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone Cobble
Carbonate Rock (CaCO3)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Vuggy Quartz / Chert
Silicon Dioxide (SiO2)
sedimentary
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)
mineral
Garnet
Garnet Group (Silicate Minerals)
mineral
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Quartzite Pebble
Quartzite (Silicon Dioxide: SiO2)
metamorphic
Quartzite Cobble
Quartzite (mostly SiO2)
metamorphic
Rough Quartz (var. Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Fossilized Shark Tooth
Carcharodon (Galeocerdo sp. or Lamniform)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Likely slag or metallic industrial byproduct
Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag
mineral
Blue Sapphire
Corundum (Al2O3)
gemstone
Diamond
Diamond (pure Carbon, C)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Moqui Marble
Iron Oxide Concretion
sedimentary
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Possible iron-rich chert or slag-like rock
Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image
sedimentary
Granite Gravel (Pebble)
Intrusive Felsic Igneous Rock
igneous
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Chert / Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Iron Ore (Hematite/Goethite)
Ironstone (Fe2O3 / FeO(OH))
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic