Quartzite Chert Pebble
Microcrystalline Silicon Dioxide (SiO2)
sedimentary/metamorphic
Category
Industrial Byproduct (Anthropogenic Material)
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Clear Quartz
Silicon Dioxide (SiO2)
mineral
Limestone with Chert
Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Quartzite River Rock
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Granite
Phaneritic plutonic rock (Quartz + Feldspar + Mica)
igneous
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Milky and Ferruginous Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartz-rich)
Arenite
sedimentary
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Granite Pebble
Granite (High-silica plutonic rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
White Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
mineral
Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Tumbled blue sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Yellow-green jasper or serpentine-rich rock
Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing
mineral
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
mineral
Dark river-worn cobble, possibly basalt or fine-grained volcanic rock
Likely basaltic rock; exact identification requires a fresh surface and tests
igneous
Rough Diamond (Bort)
Diamond (C)
mineral
Tumbled purple agate (likely grape agate or amethystine chalcedony)
Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions
mineral
Serpentinite
Serpentinite; chiefly serpentine-group minerals (lizardite, chrysotile, antigorite), commonly with magnetite and minor talc
metamorphic
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Quartz Pebble (with Hematite/Feldspar Inclusions)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (SiO2-dominated clastic rock)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary