Mineral (Metal)

Granite

Felsic intrusive igneous rock

Quartz Vein

Silicon Dioxide (SiO2)

Ruby (mounted cabochon)

Corundum, Al₂O₃; red color typically from chromium

Granite

Intrusive igneous rock

Bismuth

Bismuth (Bi)

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

Corundum, Al₂O₃; red color is typically caused by chromium

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Diamond-set letter “L” jewelry piece

Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image

Likely green aventurine or nephrite jade ring

Aventurine quartz (SiO₂) or nephrite, a variety of tremolite–actinolite amphibole

Quartz Pebble

Silicon Dioxide (SiO2)

Lepidolite

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

Metallic sulfide-bearing rock, likely galena-rich ore

Galena (lead sulfide, PbS), possibly mixed with pyrite/chalcopyrite and host rock

Granite

Felsic intrusive igneous rock

Ironstone Pebble

Sedimentary ironstone / Hematitic Sandstone

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Jasper

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Granite

Felsic intrusive igneous rock

Aura Quartz

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Blue-stone ring, likely set with blue glass or a dark-blue gemstone

The stone cannot be identified reliably from the image; possible sapphire (corundum, Al₂O₃), lapis lazuli, or glass

Limonite (Ochreous)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Likely iron meteorite

Iron–nickel meteorite, commonly octahedrite (kamacite–taenite)

Bauxite

Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Granite

Intrusive Igneous Rock

Granite and Porphyry Pebbles

Intrusive Igneous Rock

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxidized

Granite

Felsic intrusive igneous rock

Granite

Felsic intrusive igneous rock

Quartz–calcite sulfide-bearing mineral specimen

Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Iron-rich meteorite fragment (probable stony-iron or iron meteorite)

Unclassified Fe–Ni meteorite; possible weathered iron meteorite

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Moss Agate

Silicon dioxide (SiO2) with inclusions

Gold-Bearing Quartz Ore

Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)

Granite

Intrusive Igneous Rock

Copper Ore

Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)

Faceted transparent gemstone, likely glass or cubic zirconia

Uncertain from image; possible cubic zirconia (zirconium dioxide, ZrO₂) or glass imitation

Chalcopyrite in Quartz (Gold-bearing Ore)

CuFeS2 (Chalcopyrite)