Mineral (Chalcedony)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

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)

Granitic Pegmatite

Pegmatite containing Quartz, Feldspar, and Muscovite mica

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (specifically Clear and Rose Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Malachite

Copper Carbonate Hydroxide (Cu2CO3(OH)2)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Amygdaloidal Basalt

Basalt with Secondary Mineral Infillings

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Sandstone (with potential mineral inclusions)

Clastic sedimentary rock (primarily Quartz, SiO2)

Granite

Granite (Felsic Plutonic Rock)

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Limonite (Iron Ore)

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

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Sandstone

Arenite (SiO2 dominant)

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)

Fluorite

Calcium Fluoride (CaF2)

White Quartz with Black Tourmaline

Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

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)

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Not a geological specimen

N/A (man-made object)