Man Made Metamorphic Style Composite

Opalite

Synthetic glass / Opaque silicious glass

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

White-and-dark marble or agate-style gemstone bead bracelet

Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo

Opalite

Man-made opalescent glass

Opalite

Man-made opalized glass

Goldstone

Aventurine Glass (Man-made)

Sea Glass

Man-made silicate glass

Slag Glass

Amorphous Silicate (Man-made)

Ring with an Orange Inlay

N/A (Man-made object)

Sea Glass

Man-made silicate glass

Sea Glass

Man-made vitreous material

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Diamond (or Simulant)

Carbon (C)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Mother of Pearl (Nacre) / Shell Fragment

Biogenic Calcium Carbonate (Aragonite and Conchiolin)

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Silver (Jewelry form)

Native Silver (Ag)

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

Sea Glass

Silicon dioxide (mostly)

Painted River Rock

Artificially Coated Sedimentary Rock

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)