Quartzite River Stone
Metamorphic Quartzite (primarily SiO2)
metamorphic
Category
Industrial Byproduct
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Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granitic Pegmatite
Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Diamond
Native Carbon (C)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Yellow Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)
Erythrite (Co3(AsO4)2·8H2O)
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO₂)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Star Diopside
Diopside (CaMgSi2O6) with Magnetite inclusions
mineral
Diamond
Carbon (C)
mineral
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Hematite)
mineral
Basalt with Olivine Phenocrysts
Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)
Igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Diamond (Faceted)
Diamond (Carbon, C)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary