Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

metamorphic

Banded Agate (specifically shades of Carnelian Agate)

Silicon Dioxide (SiO2)

mineral

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

metamorphic

Quartz (Flesh-colored or Rose Quartz variety)

Silicon Dioxide (SiO2)

mineral

Aventurine and Amazonite

Silicon Dioxide (SiO2) with inclusions and Microcline (KAlSi3O8)

Mineral

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

metamorphic

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

sedimentary

Granite

Plutonic felsic igneous rock

igneous

Quartzite Pebble

Quartzite (SiO2)

metamorphic

Copper Ore (with Azurite and Malachite)

Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)

mineral

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

sedimentary

Quartzite

Quartzite (SiO2)

metamorphic

Chert (often called Flint or River Stone)

Chert (SiO2)

sedimentary

Glauconitic Sandstone

Glauconitic Quartz Arenite

sedimentary

Siltstone

Siltstone (primarily SiO2 with Al2O3 and Fe2O3)

sedimentary

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

mineral

Chalcedony (Agate)

Silicon Dioxide (SiO2)

mineral

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

sedimentary

Slate

Foliated low-grade metamorphic rock

metamorphic

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

igneous and sedimentary

Chert (Field Stone/Jasper variety)

Microcrystalline Quartz (SiO2)

sedimentary

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary

Granite

Granite

igneous

Chert (with Iron Staining)

Silicon Dioxide (SiO2)

sedimentary

Chert (with Quartz Veining)

Chert (formula: SiO2)

sedimentary

Quartz (Milky and Smoky variety)

Silicon Dioxide (SiO2)

mineral

Celestine (or Celestite)

Celestine (Strontium Sulfate, SrSO4)

mineral

Basalt

Basalt (Mafic volcanic rock)

igneous

Basalt

Basalt (Mafic volcanic rock)

igneous

Basalt

Extrusive mafic igneous rock

igneous

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Peridotite

Peridotite (Ultramafic Rock)

igneous

Quartzite

Quartzite (predominantly SiO2)

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Red Sandstone

Arenite (predominantly Quartz with Hematite cementation)

sedimentary

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Mineraloid (Industrial byproduct)

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

igneous

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

igneous

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

sedimentary

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

mineral

Septarian Nodule

Septarian Nodule (Calcite-filled Concretion)

sedimentary