Mineraloid (Man Made)

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Granodiorite

Granodiorite

Crushed Limestone

Calcium Carbonate (CaCO3)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Pearl

Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3

Polished blue gemstone bead bracelet, likely aquamarine

Aquamarine, blue variety of beryl (Be₃Al₂Si₆O₁₈); identification from the image is uncertain

Limonite (Yellow Ochre)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Red-orange sunstone (likely aventurine feldspar) bead bracelet

Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source

Pink opal

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

Nephrite Jade

Nephrite

Black stone-bead bracelet, likely black onyx or agate

Probably chalcedony, microcrystalline quartz (SiO₂); the photo alone cannot confirm the bead material

Amber (Copal)

Succinate (Fossilized Resin)

Amber

Succinite (approximate formula C10H16O)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Note on Image Identification: Textile

N/A (Anthropogenic material)

White Precious Opal

Hydrated Silica (SiO2·nH2O)

Obsidian

Volcanic glass (high silica volcanic rock)

Amber

Succinite (fossilized resin); C10H16O

Turquoise-colored bead necklace (likely dyed howlite or magnesite)

Likely dyed Ca₂B₅SiO₉(OH)₅ (howlite) or MgCO₃ (magnesite); turquoise is CuAl₆(PO₄)₄(OH)₈·4H₂O

Amber

Succinite (approximate formula C10H16O)

Pearl

Aragonite and Conchiolin (CaCO3 + organic protein)

Pearl

Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3

Green stone disk, possibly serpentine or jade

Indeterminate from the photograph; candidates include serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄) or jadeite jade (NaAlSi₂O₆).

Amber

Succinite (C10H16O)

Slag (Industrial Glass)

Anthropogenic Amorphous Vitreous Silicate

Polished black obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Ironstone concretion (likely limonite/goethite-rich)

Iron-oxide/oxyhydroxide-rich concretion, chiefly goethite (FeO(OH)) and limonite; identification from the photo is provisional

Amber

Succinite (approximate formula C10H16O)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Black Pearl (Tahitian Type)

Aragonite / Conchiolin composite (CaCO3)

Faience and Carnelian in Egyptian Revival Jewelry

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

Likely chert (flint) fragment

Microcrystalline quartz, SiO₂

Amber

Succinates (Organic Fossilized Resin)

Ironstone concretion (possibly a pyrite-bearing concretion)

Iron-oxide-cemented sedimentary concretion; exact mineral composition cannot be confirmed from the photograph

Jade (likely Jadeite or Nephrite)

Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Pink Opal

Hydrated Silicon Dioxide (SiO2 · nH2O)