Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic
Category
Antropogenic (Man Made Industrial Byproduct)
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Diamond
C (Carbon)
gemstone
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Flint
Silicon dioxide (SiO2)
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pallasite Meteorite
Pallasite (Stony-Iron Meteorite)
meteorite
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Bismuth
Bismuth (Bi)
Mineral
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Greenstone / serpentinite carving
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing
metamorphic
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Iron-stained quartz-rich breccia (probable)
Hydrothermal quartz–iron oxide breccia; mainly SiO₂ quartz with iron oxides/hydroxides (hematite/goethite)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Likely weathered brown rock fragment
Indeterminate; possibly basaltic or iron-stained mafic rock
igneous
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Diamond (or diamond simulant)
C
gemstone
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (Calcite, CaCO3)
sedimentary
Flint
Silicon Dioxide (SiO2) - Chert variety
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary