Organic Mineral

Turquoise

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

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)

Amygdaloidal Basalt

Basalt with Secondary Mineral Infillings

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)

Native Copper (Penny specimen)

Native Copper (Cu)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Jade (likely Jadeite or Nephrite)

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

Note: No specimen visible

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

Limonite (Ironstone)

Hydrous ferric oxides (FeO(OH)·nH2O)

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

Limonite

Limonite (FeOO·nH2O)

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide - SiO2)

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Chrysocolla on Quartz with Iron Oxides

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Staurolite (Fairy Stone)

Staurolite (formula: Fe2+2Al9Si4O23(OH))

Okenite (in Zeolite matrix)

Okenite (CaSi2O5 · 2H2O)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Sandstone

Arenite (SiO2 principal)