Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Category
Man Made (Synthetic Rock)
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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Cubic Zirconia
Zirconium dioxide (ZrO2)
gemstone
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Blue cabochon gemstone, likely sapphire
Corundum (Al₂O₃), blue variety colored mainly by iron and titanium
gemstone
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
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
Clear Quartz (faceted) / Diamond Simulant
Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)
gemstone
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Granite Pebble
Felsic intrusive igneous rock
igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Diamond (or Clear Quartz / Cubic Zirconia)
Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)
gemstone
Zirconia (Ceramic) & Ion-X Glass
Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass
Synthetic Mineral / Glass
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous