Antropogenic (Man Made Material)

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Tumbled black obsidian (likely)

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

Blue glassy fragment among beach gravel

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

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Libyan Desert Glass

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

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Chert (likely flint)

Microcrystalline quartz, SiO₂

Asphalt Pavement (with aggregate)

Asphalt concrete

Coquina

Bioclastic Limestone

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

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

Diamond

Carbon (C)

Diamond

Carbon (C)

Coquina

Bioclastic Limestone

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

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

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Diamond

Native Carbon (C)

Note: Item is a Synthetic/Man-made Object

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

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

Blue Sapphire (Synthetic or Man-made Glass Imitation)

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

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Blue slag glass or dyed glass-like industrial material

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

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Moissanite

Silicon Carbide (SiC)

Hematite Beads

Hematite (Fe2O3)

Chert (Flint)

Silicon dioxide (SiO2)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Chert (likely flint)

Microcrystalline quartz, SiO₂