Mineral (Man Enhanced)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Opalite

Synthetic Opalised Glass

Tumbled pink quartz, likely dyed

Quartz (silicon dioxide, SiO₂), probably artificially colored chalcedony or milky quartz

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Tumbled quartz-rich agate/geode fragment

Microcrystalline quartz (SiO₂), likely chalcedony with crystalline quartz and possible iron-oxide inclusions

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Carnelian Agate

Carnelian (Silicon Dioxide: SiO2) with iron oxide impurities

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Sandstone Concretion

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

Peacock ore (iridescent chalcopyrite, possibly bornite)

Chalcopyrite, CuFeS₂; the iridescent surface may be natural tarnish or artificial acid treatment. Similar material is bornite, Cu₅FeS₄.

Ruby in Matrix

Corundum (Al2O3)

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Opalite

Synthetic Glass / Man-made Opal Simulant

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2) with Bornite (Cu5FeS4) oxidation

Labradorite

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Green obsidian (likely molded or heat-treated glass-like specimen)

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

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Likely polished dark pebble

Indeterminate; possibly basalt, black jasper, or a dark sulfide-rich stone

Dyed Agate

SiO2 (Silicon Dioxide)

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Opalite

Man-made glass (traditionally simulated Opal)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Rounded banded metamorphic cobble, likely greenstone or serpentinite

Probable greenschist-facies metavolcanic rock (chlorite–actinolite schist) or serpentinized ultramafic rock

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Fossiliferous limestone with colonial coral

Calcite (CaCO₃) limestone containing fossil tabulate or rugose coral colonies

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Opalite

Synthetic opalescent glass

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Tanzanite

Blue/Violet Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))