Mineral Side Rock

Quartz (Variety of Rough Mineral Specimens)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt with Quartz Infill

Basalt (SiO2 for the quartz inclusion)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Tiger's Eye

Silicon Dioxide with Crocidolite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (with Iron Oxide staining)

Clastic Sedimentary Rock - Quartz Arenite/Wacke

Rough Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Yellow Agate

Chalcedony (cryptocrystalline silica), SiO2

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Quartz with Chalcopyrite and Pyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz

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

Turquoise

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

Limonite (with Goethite/Hematite glaze)

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

Gneiss

Gneiss (High-grade metamorphic rock)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Quartz Pebble

Silicon Dioxide (SiO2)

Moqui Marble (Iron Oxide Concretion)

Iron Oxide Concretion (primarily Limonite/Hematite around a Sandstone center)

Granite

Granite (Felsic Plutonic Rock)

Polished Black Obsidian

Volcanic Glass (70-75% SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Moonstone (Tumbled)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Albite

Amygdaloidal Basalt with Epidote

Amygdaloidal Basalt (Mafic volcanic rock)

Schist

Mica Schist

Greywacke with Quartz Vein

Greywacke (immature sandstone) with SiO2 inclusions

Bauxite

Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)

Milky Quartz in Gneiss

Quartzite / Foliated Gneiss containing SiO2

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic intrusive igneous rock)

Granite

Granite (a felsic intrusive igneous rock)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Quartz Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (with biological crust)

Arenite (SiO2 based)