Mineral (Or Mineraloid If Microcrystalline)

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Green Opal

Hydrated amorphous silica (SiO2·nH2O) with inclusions

Pearl

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

Sea Glass (Frosted Quartz/Glass)

Amorphous Silicon Dioxide (SiO2)

Amber

Succinurite (C10H16O)

Black Obsidian

Volcanic glass (Amorphous silicates)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Amber with Inclusion

Succiniferous fossil resin (C10H16O)

Amber

Succinate (Fossilized Tree Resin)

Obsidian

Obsidian (principally SiO2 with MgO and Fe3O4)

Pearl (Cultured or Natural)

Aragonite (CaCO3) with Conchiolin

Green Opal (Prase Opal)

SiO2 · nH2O (Hydrated Silicon Dioxide)

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Opalite

Synthetic glass (SiO2 + metal additions)

Snowflake Obsidian

Obsidian with Spherulitic Cristobalite (SiO2)

Pink Opal

Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Mahogany Obsidian

Volcanic glass (SiO2 + Fe2O3)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Obsidian

Volcanic Glass (Amorphous silicon dioxide with trace impurities)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Yellow Chalcedony (common opal or chert variant)

Silicon Dioxide (SiO2)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Polished black stone, likely shungite

Shungite; carbon-rich mineraloid composed mainly of amorphous carbon, with silica and other minerals

Amber (likely raw amber)

Fossilized tree resin; organic mineraloid, commonly containing succinite (not a true mineral)

Golden Sheen Obsidian

Volcanic Glass (predominantly SiO2, >70%)

Small yellow-orange mineral fragment, likely amber or iron-stained quartz

Possibly amber (fossilized resin; organic mineraloid) or quartz (SiO₂)

Amber

Amber (Fossilized Tree Resin)

Amber-bearing rough specimen

Fossilized plant resin (amber; organic mineraloid), commonly succinite

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Jade (likely Jadeite or Nephrite)

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

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Jade

Jadeite or Nephrite

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

Red Jasper

Jasper (a variety of Chalcedony, SiO₂)

Polished amber

Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral

Polished amber

Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral

Amber

Succinite (fossilized tree resin)

Amber

Succinate (Succinite for Baltic varieties)

Amber

Succinite