Anthropogenic (Man Made Material Processed By Nature)

Diamond

Carbon (C)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Small greenish crystal/mineral fragment

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

Blue Diamond

Carbon with Boron impurities (C)

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Pink Tumbled Quartz (Dyed)

Silicon Dioxide (SiO2)

Likely blue-green glassy slag or a weathered mineral fragment

Unidentified; the image does not show diagnostic features sufficient for a mineral identification

Obsidian

Volcanic glass

Opalite

Synthetic Opalite (Man-made glass)

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Goldstone beads (likely brown goldstone)

Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”

Blue obsidian-like volcanic glass

Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Green Sea Glass

Man-made silicate glass (weathered)

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by wave action)

Opalite

Synthetic Glass (Silica-based)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Sandstone Concretion

Limonitic Sandstone Concretion

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Blue opal heart cabochon

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

Green sea glass (likely)

Man-made glass, likely soda-lime silicate glass; not a natural mineral or rock

Opalite

Synthetic Glass (Simulated Opal)

Opalite

Synthetic Glass (Simulated Opal)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Blue Obsidian

Volcanic Glass (Silica, SiO2)

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

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

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

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Sandstone Pebble

Arenite (Siliclastic sedimentary rock)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)