Mineraloid (Man Made)

Pearl

Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3

Limonite (Yellow Ochre)

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

Chert / Flint

Chert (varieties include Flint)

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

White Precious Opal

Hydrated Silica (SiO2·nH2O)

Obsidian

Volcanic glass (high silica volcanic rock)

Amber (Copal)

Succinate (Fossilized Resin)

Amber

Succinite (approximate formula C10H16O)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Pearl

Aragonite and Conchiolin (CaCO3 + organic protein)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Amber

Succinite (approximate formula C10H16O)

Amber

Succinite (fossilized resin); C10H16O

Pearl

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

Amber

Succinite (approximate formula C10H16O)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Slag (Industrial Glass)

Anthropogenic Amorphous Vitreous Silicate

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Amber

Succinite (C10H16O)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Black Pearl (Tahitian Type)

Aragonite / Conchiolin composite (CaCO3)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Amber

Succinates (Organic Fossilized Resin)

Pink Opal

Hydrated Silicon Dioxide (SiO2 · nH2O)

Black Pearl (Tahitian or Irradiated Type)

Organic gemstone (Calcium Carbonate with Conchiolin Binding)

Polished black obsidian pyramid/block

Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Bumblebee Jasper

Calcite with Arsenic and Sulfur inclusions

Amber

Succinite (fossilized resin)

Amber (with potentially inclusions)

Succinite (Fossilized Tree Resin)

Jade (likely Jadeite or Nephrite)

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

Amber

Succinite (fossilized tree resin)

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Tumbled kambaba jasper (likely)

Kambaba jasper, a silica-rich microcrystalline quartz aggregate, commonly containing fossilized cyanobacterial structures and dark green amphibole/pyroxene minerals

Mahogany Obsidian

Volcanic glass (SiO2 with Hematite or Magnetite inclusions)

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3