Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
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Travertine
Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Goethite
Goethite (FeO(OH))
mineral
Jet
Lignite coal variant (hydrocarbon polymer)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Tumbled Ruby
Corundum (Al2O3:Cr)
gemstone
Jadeite Bangle
NaAl(Si2O6)
gemstone
Precious Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Jadeite Bangle
NaAlSi2O6 (Jadeite pyroxene mineral aggregate)
gemstone
Gneiss
Gneiss
metamorphic
Iron Meteorite
Iron-Nickel Meteorite (Kamacite and Taenite)
meteorite
Hematite Nodule
Iron oxide, Fe2O3
mineral
Garnet in Matrix
Almandine/Grossular Garnet in Pegmatite or Schist
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Coral
Rugose or Tabulate Coral Fossil (CaCO3 replacement)
fossil
Granite Pebble
Intrusive Igneous Rock
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossilized Echinoid Fragment (Calycinal/Boss Fossil)
Echinodermata fossil fragment
fossil
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Granite
Granite (Felsic intrusive igneous rock)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert / Flint Pebble
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint Pebble
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Coral
Rugosa or Tabulate Coral Fossil (Replacement by Silica/Calcite)
fossil
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Pumice
Pumice (Volcanic Rock / Glass Foam)
igneous
Rugose Coral Fossil
Rugosa (Order) / Horn Coral
fossil
Pumice
Pumice
igneous
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
sedimentary
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic