Mineraloid (Man Made)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Granodiorite

Granodiorite

Pearl

Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3

BROWN GRANITE (likely 'Tan Brown' or similar)

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

Granite (weathered pebble)

Granite (plutonic igneous rock)

Limonite (Yellow Ochre)

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

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Pink opal

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

White Precious Opal

Hydrated Silica (SiO2·nH2O)

Obsidian

Volcanic glass (high silica volcanic rock)

Nephrite Jade

Nephrite

Pearl

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

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Amber (Copal)

Succinate (Fossilized Resin)

Amber

Succinite (approximate formula C10H16O)

Pearl

Aragonite and Conchiolin (CaCO3 + organic protein)

Polished black obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂)

Amber

Succinite (fossilized resin); C10H16O

Amber

Succinite (approximate formula C10H16O)

Quartz

Silicon Dioxide (SiO₂)

Faience and Carnelian in Egyptian Revival Jewelry

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

Amber

Succinite (approximate formula C10H16O)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Black Pearl (Tahitian Type)

Aragonite / Conchiolin composite (CaCO3)

Polished black obsidian pyramid/block

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

Amber

Succinite (C10H16O)

Slag (Industrial Glass)

Anthropogenic Amorphous Vitreous Silicate

Chert / Flint

Chert (varieties include Flint)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

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)

Bumblebee Jasper

Calcite with Arsenic and Sulfur inclusions

Obsidian

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

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

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)