Man Made Silicate (Anthropogenic Glass)

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Opalite

Synthetic Opalised Glass

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Blue Goldstone

Man-made glass with cobalt and metal flecks

Beads (likely glass or man-made material)

N/A (artificial material)

Not a geological specimen

N/A (man-made object)

Opalite

Synthetic Glass / Man-made Opal Simulant

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Opalite (a synthetic glass)

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

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Opalite

Synthetic Glass (SiO2 + impurities)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Blue Goldstone

Aventurine Glass

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Concrete Fragment

Hardened Portland Cement Composite

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Opalite

Man-made glass (traditionally simulated Opal)

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Opalite

Synthetic Glass (Simulated Opal)

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Diamond

Native Carbon (C)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Goldstone

Aventurine glass

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Not a rock, mineral, or geological specimen

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Ring with an Orange Inlay

N/A (Man-made object)