Diorite
Intermediate plutonic igneous rock
igneous
Category
Antropogenic Rock (Man Made)
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Granite
Granite (Felsic Plutonic Rock)
igneous
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Granite Pebble
Felsic intrusive igneous rock
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Sandstone
Arenite
sedimentary
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Granodiorite
Granodiorite
igneous
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary