Man Made Material (Anthropogenic 'Mineraloid')

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

Pink opal

Common opal, hydrated amorphous silica (SiO₂·nH₂O), commonly colored by trace organic or iron compounds

Polished greenstone/serpentine pebble (probable)

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

Yellow amber beads

Amber (fossilized tree resin; organic mineraloid, not a true mineral)

Hematite Beads

Hematite (Fe2O3)

Chert (Flint)

Silicon dioxide (SiO2)

Amber

Succinite (C10H16O)

Tektite (Indochinite)

Tektite (High-silica natural glass)

Boulder Opal

Hydrated Silica (SiO2·nH2O)

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

Amber

Succinite (C10H16O)

Sea Glass

Amorphous Silica (Glass) SiO2

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Likely obsidian (possibly tektite or slag glass)

Volcanic glass; primarily SiO₂, noncrystalline

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Slate

Metamorphic Pelitic Rock

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

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Man-made Jewelry Charm (Enameled Metal)

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

Diamond

Native Carbon (C)

Black obsidian (likely)

Volcanic glass; primarily silica-rich, noncrystalline SiO₂ composition

Amber

Succinite (specifically for Baltic Amber), Formula: C10H16O

Polished mahogany obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides

Opal ring

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

Moissanite

Silicon Carbide (SiC)

Black obsidian

Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Snowflake Obsidian

Volcanic glass containing Spherulitic Cristobalite (SiO2)

Polished mahogany obsidian (probable)

Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite

Amber

Succinite (Resinite)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Coquina

Bioclastic Limestone

Amber

Succinite

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Polished black obsidian

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