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Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) with artificial dye
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities and white quartz bands
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode or Nodular Quartz
Silicon Dioxide (SiO2) in Host Matrix
mineral
Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Black Tourmaline in Quartz
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)
igneous
Amethyst
Amethyst (SiO2)
mineral
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Greenstone with Quartz Veining
Epidiorite or Metabasalt with SiO2 (Quartz) veins
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Granite
Granite
igneous
Granite Pebble
Granitoid (Felsic Plutonic Rock)
igneous
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Granodiorite
Granodiorite
igneous
Basalt with Epidote
Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Chrysocolla (on host rock)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)
mineral
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Sandstone (likely Quartzose)
Arenite
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz Geode (partially filled/solid)
Silicon Dioxide (SiO2)
sedimentary