Granite
Phaneritic Felsic Igneous Rock
igneous
Category
Anthropogenic Material (Man Made Rock)
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Basalt
Basalt (Mafic volcanic rock)
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Likely metallic meteorite fragment
Undetermined; possibly an iron meteorite or stony-iron meteorite
meteorite
Granite
Granite (plutonic igneous rock)
igneous
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Blue glassy cabochon, likely blue quartz or synthetic glass
Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
gemstone
Basalt
Basalt
igneous
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Green cabochon gemstone, likely nephrite jade
Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
gemstone
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled amethyst quartz
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Basalt
Basalt
igneous
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Tumbled brown chalcedony or jasper
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper
mineral
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Granite Pebble
Felsic intrusive igneous rock
igneous
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (in Jewelry)
Carbon (C)
mineral
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)
Quartz, silicon dioxide (SiO₂)
mineral
Carnelian cabochon
Orange-red variety of chalcedony (microcrystalline quartz), SiO₂
gemstone
Porphyry
Porphyritic Igneous Rock
igneous
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary