Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Mineraloid
Category
Organic Crystal (Mineraloid)
Browse organic crystal (mineraloid) specimens identified by the Rock Identifier community.
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Black Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Amber
Succinite
Organic Mineraloid
Amber
Succinite (Fossilized Resin C10H16O)
Organic Mineraloid
Amber
Succinite
Organic (Mineraloid)
Amber
Succinite (fossilized resin)
Organic Mineraloid
Amber
Succinite
Organic (Mineraloid)
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Amber
Succinite (C10H16O)
Organic Mineraloid
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Polished mahogany obsidian (probable)
Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite
igneous
Amber
Amber (Fossilized Tree Resin)
Mineral
Obsidian
Volcanic glass
igneous
Likely obsidian (possibly tektite or slag glass)
Volcanic glass; primarily SiO₂, noncrystalline
igneous
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Amber
Succinicum (Organic compound, primarily C10H16O)
Organic Gemstone (Mineraloid)
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Opal
Hydrated silica (SiO2 "NH2O)
mineraloid
Obsidian
Volcanic Glass (SiO2)
igneous
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous