Pearls
Aragonite (calcium carbonate) and Conchiolin
Mineraloid
Category
Mineraloid (Anthropogenic)
Browse mineraloid (anthropogenic) specimens identified by the Rock Identifier community.
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Amber
Succinite
Mineraloid
Amber
Amber (Succinite), fossilized tree resin
Mineraloid
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Amber
Succinite
mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Fulgurite
Liesegang (Fulgurite)
Mineraloid
Amber
Succinurite (C10H16O)
mineraloid
Amber / Copal
Succinite (fossilized resin)
mineraloid
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Amber (with potentially inclusions)
Succinite (Fossilized Tree Resin)
Mineraloid
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Ethiopian Opal (Welo Opal)
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Amber
Succinite (Formula: C10H16O)
Mineraloid
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
Igneous
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Limonite (Iron Ore)
Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Opal (Precious Opal)
Hydrated Silica (SiO2·nH2O)
mineral