Not A Natural Rock (Man Made Composite)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with iron oxide cement)

Yellow Quartz (Citrine or Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily composed of SiO2)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Ruby

Corundum (Al2O3 with Chromium traces)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Yellow Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Gold (Processed)

Gold (Au)

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Lapis Lazuli

Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Limestone

Calcium Carbonate (CaCO3)

Smoky Quartz

Silicon Dioxide (SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Granite

Granite

Obsidian

Obsidian (Extrusive Volcanic Glass)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)

Citrine

Citrine (Silicon Dioxide, SiO2)