Mineral (Native Element Alloy)

Banded Onyx (Mexican Onyx / Travertine)

Calcite (CaCO3) - Banded Travertine

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Quartz with Iron Oxide Inclusions

Silicon dioxide with limonite/hematite (SiO2)

Fossilized Bivalve Shell

Class Bivalvia (fossilized)

Weathered iron-rich sandstone or lateritic rock

Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite

Sandstone (with potential fossil fragments)

Sandstone (SiO2 dominated with iron oxides)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Amethyst

Quartz (SiO2)

Amethyst

Quartz (SiO2)

Amethyst (Quartz variety)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Grape Agate

Chalcedony (Silicon Dioxide, SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Biotite Schist

Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)

Gabbro

Gabbro (Coarse-grained Mafic Igneous Rock)

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Granite

Granite

Pebble

Clast (specifically a granule or small pebble)

Turquoise in Matrix

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

Dalmatian Stone

Dalmatian Stone (Felsic Igneous Rock)

Purple Chalcedony

Silicon Dioxide (SiO2)

Gneiss (Metamorphic Rock Pebble)

Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Granite

Granite

Biotite Schist with Garnet

Garnet-Biotite Schist

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Quartz pebble

Silicon dioxide (SiO2)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Green Calcite

Calcium Carbonate (CaCO3)

Limonite (Ironstone Concretion)

Limonite (FeO(OH)·nH2O)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Blue Quartz (specifically Dumortierite Quartzite)

Silicon Dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)

Pink Granite

Granite (High K-Feldspar variety)

Granite

Phaneritic plutonic igneous rock (SiO2 range 65-75%)

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Quartz Geode

Macrocrystalline Quartz (SiO2) within a geode structure

Watermelon Tourmaline in Quartz Matrix

Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4