Not A Rock (Man Made Industrial Metal)

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Bornite

Cu5FeS4

Peridot (Olivine)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Granite

Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)

Possible metallic meteorite or iron-rich mineral

Uncertain; visually compatible with an iron meteorite, metal-rich chondrite, or magnetite-bearing rock

Rhyolite

Extrusive igneous rock (felsic)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Iron-stained quartz-rich breccia

Silicified, limonite/goethite-stained breccia; chiefly SiO₂ (quartz) with FeO(OH)·nH₂O iron oxides

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Pink Granite

Granite

Diamond

Carbon (C)

Diamond (Colorless/White)

Carbon (C)

Basalt

Basalt

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Olivine (Peridot Stone)

(Mg, Fe)2SiO4 (Magnesium Iron Silicate)

Smoky quartz ring

Quartz, SiO₂ (likely smoky quartz)

Cupronickel Coin

Copper-Nickel Alloy (typically 75% Cu, 25% Ni)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Granite

Felsic intrusive igneous rock

Pearl-embellished decorative cross

Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones

Pallasite Meteorite

Pallasite (Stony-Iron Meteorite)

Iron Slag

Anthropogenic pyrometallurgical byproduct

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Copper ore-bearing rock (likely malachite/chrysocolla in a sulfide-rich matrix)

Cuprite–malachite/chrysocolla mineralization; probable copper sulfides such as chalcopyrite in altered host rock

Black Onyx

Chalcedony (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Intrusive igneous rock

Diamond (Faceted)

Carbon (C)

Ironstone (possibly Bog Iron or Limonite)

Goethite-rich Ironstone (FeO(OH))

Iron meteorite (likely etched or weathered iron meteorite)

Fe–Ni alloy, predominantly kamacite and taenite; possible ataxite/hexahedrite or coarse octahedrite

Iron Slag

Anthropogenic Iron oxide/Silicate composite

Nickel–iron meteorite (likely weathered iron meteorite)

Fe–Ni alloy, chiefly kamacite and taenite

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Red gemstone ring, possibly synthetic ruby or red glass

Unidentified red stone; ruby is corundum (Al₂O₃), but the image cannot confirm its identity