Organic Gemstone (Not A Mineral)

Amber

Succinite

Pearl

Nacre (Aragonite and Conchiolin), CaCO3

Pearl (in Marcasite Jewelry)

Biogenic Calcium Carbonate (primarily Aragonite, CaCO3)

Jasper

Silicon dioxide (SiO2)

Amber

Fossilized Tree Resin

Amber

Fossilized tree resin

Amber

Succinite (a common variety of fossilized resin)

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Pumice

Vesicular volcanic glass, predominantly rhyolitic to dacitic composition

Gold Sheen Obsidian

Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3

Likely rough amazonite

Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Polished amber-like organic gemstone

Amber (fossilized tree resin), commonly succinite; exact identification is uncertain from the image

Polished serpentine

Serpentine-group minerals, chiefly lizardite and/or antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Amber

Succinite (fossilized resin)

Tahitian Pearl (Black / Pistachio Pearl)

Biogenic Aragonite / Calcite (CaCO3 with conchiolin)

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin

Amber

Succinite (Fossilized Tree Resin)

Tumbled amber

Amber (fossilized plant resin; commonly succinite, C10H16O)

Tumbled amber

Amber (fossilized plant resin; commonly succinite, C10H16O)

Amber

Succinicum (Organic polymer, largely C10H16O)

Precious Red Coral

Corallium rubrum / Corallium japonicum

Amber

Fossilized Tree Resin (Organic Polymer)

Amber

Succinite (Fossilized Tree Resin)

Amber

Succinite (amorphous organic polymer)

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Black Obsidian with white veins

Volcanic Glass (70–75% SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Pearl

Calcium carbonate (CaCO3) in the form of Aragonite or Calcite

Petrified Wood

Silicified Wood (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Green Chert

Microcrystalline Quartz (SiO2)

Chalcopyrite

CuFeS2

Orange Calcite

Calcium Carbonate (CaCO3)

Moss Agate / Chalcedony

Silicon Dioxide (SiO2)

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone

Green Jasper

Microcrystalline Quartz (SiO2) with mineral inclusions

Amber

Fossilized Tree Resin (C10H16O)

Obsidian (volcanic glass)

Obsidian, naturally occurring rhyolitic volcanic glass; composition is silica-rich, commonly about 70–75% SiO₂

Polished mahogany obsidian

Volcanic glass (mostly SiO₂), commonly called mahogany obsidian