Anthropogenic Specimen (Man Made Material)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Sea Glass

Man-made vitreous material (silica-based glass)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Chert (Arrowhead Shard)

Microcrystalline silica (SiO2)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

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

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

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Brick fragment (Man-made material)

N/A (Fired clay)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Opalite

Synthetic glass / Opalized glass

Blue Sea Glass

Amorphous Silica (Anthropogenic glass)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Vesicular basalt (weathered scoria)

Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Crackle Agate / Dyed Quartz

SiO2 (Silicon Dioxide)

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Mohave Turquoise (Composite/Stabilized)

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

Opalite

Man-made glass (traditionally simulated Opal)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates