Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
mineral
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Tumbled Agate
Silicon Dioxide (SiO2)
sedimentary
Pink Quartz
Silicon Dioxide (SiO2)
mineral
K-Feldspar (Potassium Feldspar)
Orthoclase / Microcline (KAlSi3O8)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Granite Pebble
Intrusive Igneous Rock
igneous
Honey Calcite
Calcite (CaCO3)
mineral
Limestone
Sedimentary Rock (Primarily Calcite: CaCO3)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Gold Nugget
Gold (Au)
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Jasper / Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2)
mineral
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Quartzite with Pyrite Inclusions
Metamorphic Quartz-rich Rock
metamorphic
Granite
Intrusive Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rodonite
Rhodonite (MnSiO3)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony quartz variety Heliotrope (SiO2)
gemstone
White Chalcedony
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, Microcrystalline Quartz
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Fossilized Oyster Shell
Ostrea / Exogyra (Phylum Mollusca)
fossil
Mica Schist
Metamorphic rock predominantly composed of muscovite or biotite with quartz and feldspar
metamorphic