Mineral (Native Element Alloy)

Limonite (Iron Ore)

Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)

Amethyst

Silicon dioxide / Violet Quartz (SiO2)

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO₂)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Rhodochrosite

Manganese Carbonate (MnCO3)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Turquoise

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

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Pink Granite

Granite (High K-Feldspar variety)

Amygdaloidal Basalt

Basalt with Secondary Mineral Infillings

White Sapphire

Corundum (Al2O3)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Limonite / Ironstone Nodule

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

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Ferruginous Sandstone (Gozzanous)

SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)

Sandstone (with banding)

Arenite (primarily SiO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Pegmatite

Pegmatitic Granite

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Chevron Amethyst

Silicon Dioxide (SiO2) with trace Iron impurities

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Limonite (Ironstone)

Hydrous ferric oxides (FeO(OH)·nH2O)

Jade (likely Jadeite or Nephrite)

Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Note: No specimen visible

Milky Quartz

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·nH2O)

Bauxite

Bauxite (Al2O3·nH2O)

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)