Man Made Material (Anthropogenic 'Mineraloid')

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Obsidian

Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Chert (likely flint)

Microcrystalline quartz, SiO₂

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Asphalt Pavement (with aggregate)

Asphalt concrete

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Asphalt fragment

Bituminous concrete

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Diamond

Carbon (C)

Diamond

Carbon (C)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Amber

Succinite (Fossilized Tree Resin)

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

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

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Limonite (Ironstone)

Limonite (mixture of hydrated iron(III) oxide-hydroxides)

Amber

Succinate (Fossilized Tree Resin)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Blue slag glass or dyed glass-like industrial material

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

Black obsidian

Volcanic glass; predominantly rhyolitic silica glass (approximately 70–80% SiO₂)

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Amber

Succinite

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment