Mineral

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Fluorite

Calcium Fluoride (CaF2)

Limonite (also known as Yellow Ochre or Brown Hematite)

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

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Limonite with Opal infusion

FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Native Copper

Native Copper (Cu)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz (Granular Milky Quartz fragment)

Silicon Dioxide (SiO2)

Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Hematite (Concretion)

Iron(III) oxide (Fe2O3)

Orthoclase Feldspar (Twinning Specimen)

Orthoclase (KAlSi3O8)

Fluorite (Purple Fluorite in Matrix)

Fluorite (Calcium Fluoride, CaF2)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Schist with Quartz Veins

Schist with Quartz (SiO2)

Gneiss (specifically a Granitic Gneiss specimen)

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

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Fluorite Geode

Calcium Fluoride (CaF2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Schist

Schist (Crystalline metamorphic rock)

Rutilated Quartz

Silicon Dioxide (SiO2) with inclusions of Titanium Dioxide (TiO2)

Sandstone (with Iron Staining)

Arenite (SiO2 with Fe2O3/FeOOH impurities)

Red Sandstone

Arenite (Fe2O3 enriched)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Quartz Vein

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Hematite cement (SiO2 + Fe2O3)

Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Sandstone

Arenite

Limonite with Galena

FeO(OH)·nH2O (Limonite) and PbS (Galena)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Sandstone

Arenite (SiO2 based typically)