Anthropogenic (Man Made Material Processed By Nature)

Obsidian Arrowhead

Obsidian (Volcanic Glass)

Gypsum (Wallboard/Drywall)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Jade-and-cabochon fruit cocktail ring

Likely nephrite or jadeite (jade) leaves with orange/cream chalcedony or other cabochons; identification from the image is uncertain

Diamond

Native Carbon (C)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Dark blue polished stone pendant

Indeterminate; possibly sodalite, lapis lazuli, or blue slag/glass-like material

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Tumbled pink feldspar (likely moonstone or orthoclase)

Potassium feldspar, chiefly orthoclase (KAlSi₃O₈); possibly adularescent moonstone

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Gold-bearing placer gravel (possible gold flakes)

Unconsolidated alluvial sediment containing quartz, lithic fragments, and possibly native gold (Au)

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminum silicate), likely with malachite/azurite and copper sulfides

Mica Schist with Garnet

Garnetiferous Mica Schist

Chert / Flint

Microcrystalline Quartz (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sea Glass

Amorphous Silica (Anthropogenic glass) - SiO2

Coquina Limestone

Coquina (Biogenic Limestone)

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Chert (Arrowhead/Projectile Point)

Microcrystalline quartz (SiO2)

Opalite

Synthetic Opalised Glass

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Iron-rich slag or weathered ironstone fragments

Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Green cabochon gemstone pendant, likely turquoise or dyed green turquoise

Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Tumbled banded agate beads

Agate, microcrystalline quartz (SiO₂), a variety of chalcedony

Cubic Zirconia (CZ) Jewelry

Zirconium dioxide (ZrO2)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Carved lavender chalcedony (likely agate) animal figurine

Microcrystalline quartz, SiO₂; probable chalcedony or pale lavender agate

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Gold-bearing quartz or ironstone fragment

Quartz (SiO₂) with possible native gold and iron oxides

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Goldstone (blue-goldstone–style glass) beads

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

Chert (Arrowhead Artifact)

Microcrystalline Quartz (SiO2)