Mineral, Metal (Element)

Rhyolite

Extrusive igneous rock (felsic)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Raw fluorite-bearing rock, possibly fluorite in quartz/calcite matrix

Fluorite (CaF₂), with likely quartz (SiO₂) and/or calcite (CaCO₃) gangue

Arfvedsonite in Matrix

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite)

Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)

Lepidolite

K(Li,Al)3(Al,Si,IV)4O10(F,OH)2

Celestite (Celestine)

Strontium sulfate (SrSO4)

Small brown mineral/rock fragment

Indeterminate; possibly weathered quartz-rich rock, ironstone, or a sulfide mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Slag Glass

Silicon dioxide with impurities

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Native Copper

Native Copper (Cu)

Lepidolite

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

Lepidolite

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

Gold Nugget

Native Gold (Au)

Tumbled hematite

Hematite (Fe₂O₃), likely polished specular hematite

Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole

Polished blue agate geode slice

Chalcedony (microcrystalline quartz), SiO₂, with possible quartz/drusy lining and iron-oxide coloration

Lepidolite with Tourmaline in Quartz Matrix

K(Li,Al)3(Si,Al)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)

Gossan (with Limonite and Hematite)

Gossanous iron-oxide rock (Fe2O3 · nH2O)

Quartz-rich pegmatitic rock, possibly tourmaline-bearing granite

Granitic pegmatite; predominantly quartz (SiO₂), feldspar, and mica, with possible schorl tourmaline

Clear faceted gemstone in a metal jewelry setting (likely imitation glass or cubic zirconia)

Unidentified transparent faceted stone; possibly cubic zirconia (ZrO₂) or glass

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Green Fluorite

Calcium Fluoride (CaF2)

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Gold

Native Gold (Au)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Likely iron meteorite fragment

Unclassified Fe–Ni meteorite; possible stony-iron fragment

Opalite

Synthetic Glass / Man-made Opal Simulant

Quartz geode (druzy quartz cavity)

Silica, SiO₂; microcrystalline-to-crystalline quartz lining a volcanic vesicle

Tumbled pink-orange feldspar

Microcline or orthoclase feldspar, KAlSi₃O₈ (tentative)

Mica-rich pegmatite (likely muscovite-bearing granite)

Pegmatite; chiefly quartz (SiO₂), feldspar, and muscovite mica

Quartz-rich pegmatite specimen

Pegmatite composed mainly of quartz (SiO₂), feldspar, and mica, with possible tourmaline or garnet inclusions

Pyrite

Iron Sulfide (FeS2)

Quartz-bearing Ore (likely Gold-bearing Quartz)

Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)

Gold Nugget

Native Gold (Au)

Quartz-rich pegmatite fragment

Granitic pegmatite, chiefly quartz (SiO₂) with feldspar and mica

Bismuth Crystal

Bismuth (Bi)

Gold Nugget

Native Gold (Au)

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Blue lace agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)