Mineral (Man Made Glass, Not Natural)

Sunstone

Aventurine Feldspar (Plagioclase Feldspar with inclusions)

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Granite

Intrusive igneous rock (Acidic)

Turquoise (Blue Howlite / Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

Dragon Vein Agate

Silicon Dioxide (SiO2)

Diamond

Diamond (pure Carbon, C)

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Granite

Phaneritic Igneous Rock (Granite)

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Mica Schist

Mica Schist (Complex Silicate Rock)

Agate

Banded Chalcedony (SiO2)

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

Granite

Phaneritic Felsic Igneous Rock (Granite)

Ferruginous Sandstone (Red Sandstone)

Arenite with Hematite/Limonite cement

Iron Ore (Limonite and Hematite)

Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Obsidian (Apache Tear)

Obsidian / Amorphous Volcanic Glass (main component: SiO2)

Granite

Phaneritic plutonic rock (Felsic)

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Smoky Quartz

SiO2 (Silicon Dioxide)

Quartzite

Quartzite (primarily SiO2)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Diamond

Diamond (Pure Carbon, C)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Quartz (Yellow/Milky variety)

Silicon Dioxide (SiO2)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)

Smoky Quartz in Matrix (Pegmatite)

Silicon Dioxide (SiO2) with Potassium Feldspar and Biotite mica

Smoky Quartz

Silicon Dioxide (SiO2)

Corundum

Corundum (Aluminium oxide, Al2O3)

Quartzite with Sandstone/Iron staining

Metamorphic Quartzite (SiO2)

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Limonite (Pseudomorph after Pyrite/Marcasite)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Pyrite

Iron Disulfide (FeS2)

Sandstone (lithic/greywacke variant)

Clastic sedimentary rock (primarily SiO2 with rock fragments)