Minerals

Kaolinite Claystone

Al2Si2O5(OH)4 (Kaolinite)

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))

Copper Ore (with Azurite and Malachite)

Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)

Pyrite

Iron Pyrite (FeS2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Gneiss (with Quartz and Biotite Mica)

Gneiss

Lapis Lazuli

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

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.

Limonite (Ironstone Concretion)

Limonite (FeO(OH)·nH2O)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Glacial Granite with Epidote

Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Celadonite in Amygdaloidal Basalt

K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix

Milky Quartz

Silicon Dioxide (SiO2)

Granatic Pegmatite

Pegmatitic Granite

Granitic Pegmatite with Muscovite Mica

Pegmatite (containing KAl2(AlSi3O10)(OH)2)

Granitic Pegmatite

Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica

Pegmatitic Granite

Granite (Alkali-feldspar granite) with Quartz and Orthoclase

Mica Schist

Mica Schist (Complex Silicate Rock)

Turquoise in Matrix

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Fossilized Shark Tooth

Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)

Blue Quartz (Dumortierite Quartz)

SiO2 containing inclusions of Dumortierite [Al7(BO3)(SiO4)3O3]

Diorite

Diorite

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Gabbro

Gabbro (mafic intrusive rock)

Diorite with Xenolith

Intermediate Plutonic Igneous Rock (Diorite)

Banded Gneiss

Gneiss

Diorite

Phaneritic Intermediate Plutonic Rock

Gneiss

Gneiss

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (Pink/Potassium-rich)

Pink Granite (contains K-Feldspar, Quartz, and Plagioclase)

Fluorite

Fluoride (Calcium Fluoride - CaF2)

Alkali Feldspar Granite

Alkali Feldspar Granite (KAlSi3O8)

Diamond

Native Carbon (C)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Kimberlite

Kimberlite (Group I or II)

Diamond

Carbon (C)

Diorite (River Cobble)

Intrusive Igneous Diorite

Pyrite

Iron Disulfide (FeS2)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)