Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
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Granite
Granite (Felsic Plutonic Rock)
igneous
Granitoid (Granite/Gneiss mix)
Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)
igneous/metamorphic
Schist
Mica Schist
metamorphic
Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
igneous
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Thunderegg
Agate-filled Rhyolitic Nodule (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
metamorphic
Agate (or Chalcedony with Moss/Jasper Inclusions)
Silicon Dioxide (SiO2)
mineral
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Desert Rose
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O) or Barite (Barium Sulfate, BaSO4)
mineral
Quartz Geodes and Crystal Clusters
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Geode or Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (High-silica plutonic rock)
igneous
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Basalt
Extrusive mafic igneous rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary
Sandstone (with prominent jointing/fractures)
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic