Green Jasper / Plasma
Microcrystalline Quartz (Chalcedony), SiO2 with inclusions
gemstone
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Petrified Wood
Silicified Wood / Xylopal
fossil
Red Jasper and Green Aventurine
Silicon dioxide (SiO2)
mineral
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz variety
sedimentary
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartz Vein Pebble
Silicon dioxide (SiO2)
metamorphic
Wishing Stone (Quartz-veined Sedimentary Pebble)
Silicified sedimentary rock with quartz vein (SiO2)
sedimentary
Worry Stone
Weathered Quartzite or Sandstone
sedimentary
Agate Nodule
Silicon dioxide (Chalcedony/Quartz), SiO2
sedimentary
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
River Pebble
Polished Rock Fragment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Pebble
Lithic fragment / Weathered rock fragment
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Limestone Pebble
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Limestone pebble
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous