Antropogenic (Man Made Industrial Byproduct)

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Opalite

Synthetic Opalised Glass

Dyed Agate

Chalcedony (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Basalt or Slag

Extrusive Igneous Rock / Industrial Slag

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Iron meteorite fragment (likely metallic meteorite)

Fe–Ni kamacite/taenite alloy; exact identification requires testing

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Polished black stone, likely black obsidian

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

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Rounded metallic-looking pebble, likely iron-rich rock or slag

Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag

Opalite

Synthetic Glass (Simulated Opal)