Metal (Elemental Mineral)

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Milky Quartz

Silicon Dioxide (SiO2)

Native gold nuggets

Gold (Au), usually with minor silver and copper

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Porphyritic basalt or weathered volcanic rock

Basalt, likely plagioclase–pyroxene rock with possible olivine; exact identification requires testing

Native gold-bearing sulfide specimen

Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)

Beryl (Emerald Variety)

Beryllium Aluminum Silicate (Be3Al2(SiO3)6)

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Lepidolite

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

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Lepidolite with Quartz

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

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Native Silver

Silver (Ag)

Nickel

Nickel (Ni)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (Plutonic Igneous Rock)

Sandstone

Arenite (SiO2 based)

Polished agate pendant (likely carnelian or plume agate)

Microcrystalline quartz, SiO₂ (chalcedony); exact variety cannot be confirmed from the image

Opalite

Synthetic glass (SiO2 + metal additions)

Amethyst ring

Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones

Bauxite

Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)

Bauxite

Aluminum ore / Hydrated aluminum oxides

Granitic Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Hollow geode or vesicular volcanic rock

Likely quartz-lined basaltic/andesitic vesicle; exact identification requires testing

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Gold-bearing quartz or ironstone fragment

Quartz (SiO₂) with possible native gold and iron oxides

Diamond (in a gold setting)

Carbon (C)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Slag

Metallurgical by-product

Rounded greenish-gold rock or mineral pebble

Indeterminate; possibly serpentine-rich stone, weathered sulfide, or iron-stained metamorphic rock

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Quartz-rich hydrothermal mineral specimen, possibly vanadinite-bearing matrix

Quartz (SiO₂) with unidentified red-brown accessory minerals; exact species requires testing

Milky Quartz

Silicon Dioxide (SiO2)

Collection of Minerals and Ores

Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)

Lepidolite

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

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Milky Quartz

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)