White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Category
Mineralogical
Browse mineralogical specimens identified by the Rock Identifier community.
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Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Amber
Succinates
mineraloid
Obsidian
Volcanic Glass (SiO2)
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Opalite
Man-made opalescent glass
gemstone
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Amber
Succinite
mineral
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Amber
Succinite (Resinite)
mineraloid
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
Igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Amber with Organic Inclusions
Succinite (fossilized resin)
mineraloid
Limonite (Iron Ore)
Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O
mineral
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Green Opal
Hydrated amorphous silica (SiO2·nH2O)
mineraloid
Amber (Copal)
Succiniferous Resin
mineraloid
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber (Copal)
Fossilized Tree Resin
mineraloid
Green Opal or Yellow Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Green Opal
Hydrated amorphous silica (SiO2·nH2O) with inclusions
mineraloid
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber
Succinite (fossilized tree resin)
mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Amber
Succinite (fossilized resin)
mineraloid
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Amber
Succinrite (Organic Gemstone)
mineraloid
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Amber
Amber (Succinite), fossilized tree resin
Mineraloid
Conch Pearl
Calcareous concretion (CaCO3)
mineraloid