Mineral (Metal)

Gold Nugget

Native Gold (Au)

Fossil bone or tooth fragment

Mineralized fossil vertebrate bone/tooth; exact taxon cannot be determined from the photograph

Quartz (Clear or Milky)

Silicon Dioxide (SiO2)

Gossan / Iron Ore Rock

Hematite / Goethite / Limonite iron oxide assemblage

Iron-stained quartz-bearing rock (probable weathered quartz vein or ironstone)

Quartz (SiO₂) with goethite/limonite iron oxides; possibly altered volcanic or metamorphic host rock

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Native Silver Nugget

Silver (Ag)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Diamond (set in jewelry)

Diamond (Carbon, C)

Diamond (in a gold ring)

Diamond (pure carbon, C)

Green aventurine beads

Aventurine quartz, SiO₂, colored green by fuchsite or other inclusions

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Emerald and Diamond (Jewelry Setting)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)

Lavender Quartz (appearing as beads) and Druzy Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (Gossanous Matrtix)

Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Lepidolite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite

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

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Pink faceted gemstone, likely amethyst or pink quartz

Quartz (SiO₂), likely pale amethyst; exact identification requires testing

Goethite / Limonite Gossan

Hydrated Iron Oxide (FeO(OH))

Milky quartz with possible mica or feldspar inclusions

Quartz (SiO₂), likely with minor inclusions

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Epithermal Gold Ore (in Quartz/Rhyolite matrix)

Auriferous Quartz (Au + SiO2)

Quartz-rich hydrothermal ore rock, likely gold-bearing quartz vein

Milky quartz (SiO₂) with iron-oxide staining and probable sulfide minerals; host rock may be schist or altered granite

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Possible iron-rich meteorite or metallic sulfide-bearing rock

Unconfirmed; candidates include stony-iron meteorite, iron meteorite, or pyrite-bearing terrestrial rock

Cubic Zirconia (CZ) Jewelry

Zirconium dioxide (ZrO2)

Granite

Intrusive igneous rock

Granite

Felsic intrusive igneous rock

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Iron-oxide-rich weathered rock

Limonite/goethite-bearing ironstone; chiefly hydrated iron oxides, often FeO(OH)·nH₂O

Aventurine

Quartz (SiO2) with inclusions of Fuchsite

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Milky Quartz

Silicon Dioxide (SiO2)