Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
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Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Colorless Quartz (Rhinestone)
Silicon Dioxide (SiO2)
mineral
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Weathered basalt or other dark volcanic rock
Likely basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine and iron oxides
igneous
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
sedimentary
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Chert (often called Flint when dark or worked)
Cryptocrystalline silica (SiO2)
sedimentary
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (possible scoria)
Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Dolerite (Diabase)
Dolerite / Diabase
igneous
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous