Mineral Based Human Made Alloy

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Granite

Phaneritic Felsic Intrusive Igneous Rock

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Graphite

Graphite (Carbon, C)

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Chert (or Limestone)

Sedimentary Cryptocrystalline Quartz (SiO2) or Calcium Carbonate (CaCO3)

Chert (specifically Flint)

Chert (SiO2)

Bismuth

Bismuth (Bi)

Nickel

Nickel (Ni)

Aquamarine

Beryl (Be3Al2Si6O18 with Fe impurities)

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

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Sandstone

Arenite (SiO2 based)

Sandstone Pebble

Arenite (SiO2 based)

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Coarse Sandstone

Arenite (SiO2 based)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

N/A (Non-Geological Object)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Kidney Stone (Calcium Oxalate / Uric Acid)

Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Chert (and Flint)

Silicon Dioxide (SiO2)

Schist

Schist

Orange Crackle Quartz

Silicon Dioxide (SiO2) with thermal fracturing

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)