Mineral (Metal)

Granite

Intrusive Igneous Rock

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Vanadinite

Pb5(VO4)3Cl

Pyrite

Iron Sulfide (FeS2)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron

Native Copper

Native Copper (Cu)

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Gold Nugget / Flake

Native Gold (Au)

Bismuth

Bismuth (Bi)

Multi-stone gemstone ring

Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy

Faceted brown gemstone in a silver-colored setting

Likely smoky quartz (SiO₂), but the photo cannot reliably distinguish it from other brown gems or glass

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Beryl (Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Red garnet cabochon-style earrings

Likely almandine garnet (Fe₃Al₂(SiO₄)₃); the image alone cannot confirm the stone or whether it is natural or synthetic.

Milky Quartz with Mica Matrix

SiO2 (Silicon Dioxide) with Muscovite/Biotite mica

Sunstone

Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)

Chromite

Chromite (FeCr2O4)

Quartz Vein in Basalt or Sedimentary Host Rock

Silica-veined lithic fragment (SiO2 in host matrix)

Sandstone (Whetstone/Sharpening Stone)

Siliciclastic Sandstone (SiO2 dominant)

Sapphire in a ring

Corundum (Al2O3)

Granite

Intrusive Igneous Rock

Fluorite Bracelet

Calcium Fluoride (CaF2)

Amethyst stud earrings

Amethyst, purple quartz (SiO₂)

Red jasper (likely polished and carved)

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

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) treated with metallic vapor

Milky Quartz

Silicon Dioxide (SiO2)

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Porphyritic Basalt or Porphyritic Andesite

Porphyritic Extrusive Igneous Rock

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Uncertain small metallic-looking mineral/rock fragment

Indeterminate; possibly galena-bearing rock or metallic slag

Biotite-rich mica schist

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Native Copper (Penny specimen)

Native Copper (Cu)

Quartz Pebble

Silicon Dioxide (SiO2)

Lepidolite

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

Gold-bearing quartz or ironstone fragment

Quartz (SiO₂) with possible native gold and iron oxides