Mineral (Native Element Alloy)

Quartz (White/Milky Pebble)

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (CaCO3)

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Garden Quartz (Lodolite)

Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)

Schist

Mica Schist

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety

Pyrite in Quartz

FeS2 (Iron Pyrite) with SiO2 (Quartz)

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Schist

Mica Schist

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Larimar

Pectolite (a blue variety of Pectolite)

Green Calcite

Calcite (CaCO3)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Azurite

Azurite (Cu3(CO3)2(OH)2)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (composed primarily of SiO2)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Smoky Quartz

Smoky Quartz (SiO ₂)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)