Mineral (Processed Alloy)

Tumbled tiger’s eye

Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite

Polished red jasper beads

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Likely polished copper-bearing stone or copper nugget

Uncertain from the image; possibly native copper (Cu) or copper-stained rock

Milky Quartz

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)

Native Copper (in coinage alloy)

Copper (Cu)

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Beryl (Aquamarine variety)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Small metallic sulfide fragment, possibly pyrite-bearing ore

Likely pyrite (iron disulfide, FeS₂), though the image is insufficient for definitive identification

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Granite

Intrusive Felsic Igneous Rock

Red-orange sunstone (likely aventurine feldspar) bead bracelet

Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source

Quartz crystal pendant (likely smoky quartz or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled amethyst

Quartz, SiO₂; purple coloration from iron-related defects and irradiation

Black tourmaline beads (likely schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tumbled and polished quartz crystal points

Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Lapis lazuli bead bracelet

Lazurite-bearing calcite–pyrite rock; lazurite formula (Na,Ca)₈(AlSiO₄)₆(S,SO)₂

Iron Meteorite

Meteoritic Iron (Fe-Ni alloy)

Native Copper

Native Copper (Cu)

Granite

Granite (interlocking crystals of quartz, feldspar, and mica)

South Korean 100 Won Coin (Cupronickel)

Cupronickel Alloy (75% Cu, 25% Ni)

White quartz bead strand (likely milky quartz)

Quartz, silicon dioxide (SiO₂), crystalline silica

Green tourmaline (likely chrome/dravite tourmaline crystals)

Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula

Amethyst ring

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

Rough green beryl (possibly aquamarine)

Beryl, Be₃Al₂Si₆O₁₈; green color commonly from iron or chromium

Polished banded calcite (often sold as “onyx marble” or Mexican onyx)

Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Likely polished greenstone or serpentine inlay

Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade

Gold

Aurum (Elemental Gold, Au)

Gold-bearing sulfide ore (tentative)

Native gold, likely with pyrite/chalcopyrite in quartz or altered rock

Tumbled Hematite with Quartz/Chert (Specular Hematite)

Fe2O3 (Iron Oxide)

Faceted diamond gemstone (likely)

Diamond — crystalline carbon, C

Magnetite (lodestone), possibly meteoritic iron

Magnetite, Fe₃O₄; exact identification is uncertain from the image alone

Iron Meteorite (likely an Individual specimen)

Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)

Tumbled carnelian agate

Microcrystalline quartz (chalcedony), SiO₂; iron-oxide colored

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Iron Meteorite

Siderite (meteoritic iron, Fe-Ni alloy)

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony