Anthropogenic (Man Made Material Processed By Nature)

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Iron-rich vesicular rock, possibly slag or weathered basalt

Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Green Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Opalite

Synthetic Opalized Glass / Man-made Glass

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Sandstone Concretion

Clastic Sedimentary Concretion (SiO2 with Iron Oxide)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

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

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline quartz (SiO₂)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Polished black stone, likely black obsidian

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

Coquina

Biogenic Limestone (Coquina)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Chert (Arrowhead)

Chert (SiO2)

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Graphite

Graphite (Carbon, C)

Mixed gemstone bead strand, likely including agate, quartz, turquoise, and sandstone beads

Varied silicate and copper-mineral materials; exact bead identities cannot be confirmed visually

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Sandstone Concretion

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