Mineral (Native Element Alloy)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Limonite Concretion (Ironstone)

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

Limonite (vibrant yellowish-brown iron oxide)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Quartz (Druzy)

Silicon Dioxide (SiO2)

Alexandrite

Chrysoberyl (BeAl2O4)

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Granite

Granite (Felsic intrusive igneous rock)

Quartz with Chalcopyrite and Pyrite

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

Lapis Lazuli

Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Quartz with Tourmaline and Iron Staining

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

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Quartz Geode

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz with inclusions (likely Tourmaline or Biotite)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (principally SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Rose Quartz

Rose Quartz (SiO2 with trace Ti, Fe, or Mn)

Fluorite (likely Fluorite on Quartz/Matrix)

Calcium Fluoride (CaF2)

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Amethyst (Faceted)

Silicon Dioxide (SiO2) with iron impurities

Amethyst

SiO2 (Silicon Dioxide) - Purple variety of Quartz

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Pegmatite (White Granite variant)

Pegmatitic Granite (Quartz and Feldspar rich)