Metal (Elemental Mineral)

Gold

Native Gold (Au)

Green aventurine bead bracelet

Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Polished brecciated jasper

Microcrystalline quartz (SiO₂) with iron-oxide-rich matrix and possible chalcedony

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Native Copper in Matrix

Native Copper (Cu)

Likely hematite-rich ironstone or metallic mineral fragment

Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron

Bauxite

Bauxite (Mixture of Hydrous Aluminum Oxides)

Red Sandstone (Iron-Rich)

Arenite (Fe2O3)

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Gold

Gold (Au)

Opalite

Man-made opalized glass

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Anthracite coal

Anthracite; predominantly carbon (C), with minor macerals, ash, sulfur, and trace minerals

Aura Druzy Agate (Star Shape)

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Coating

Pyrite (“fool’s gold”)

Pyrite, FeS₂; cubic iron sulfide

Tumbled metallic sulfide mineral, likely pyrite

Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule

Diamond ring

Diamond (crystalline carbon, C)

Aura Quartz (Titanium or Angel Aura coated)

Silicon Dioxide (SiO2) with metallic vapor coating

Gold

Native Gold (Au)

Blue Goldstone

Man-made glass with cobalt and metal flecks

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

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

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Diamond engagement ring

Diamond, crystalline carbon (C)

Vesicular basalt pebble

Basalt; chiefly plagioclase, pyroxene, and olivine

Iron-oxide-stained sulfide-bearing rock, possibly pyrite-bearing schist

Likely quartz–mica schist or massive sulfide rock with pyrite (FeS₂) and limonite/goethite (FeO(OH)·nH₂O)

Iron-Stained Quartz/Quartzite

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

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Vesicular basalt (likely weathered volcanic rock)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Lepidolite

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

Labradorite cabochon

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Gossan (Iron Hat)

Limonitic Gossan (Fe2O3·nH2O)

Diamond ring

Diamond (crystalline carbon, C)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Gold Ore (in Quartz/Pyrite)

Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)

Quartz Vein in Schist

Quartz (SiO2) in Pelitic Schist

Chert (Nodule)

Silicon Dioxide (SiO2)

Polished turquoise cabochon pendant

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O