Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Category
Sedimentary (Or Mineraloid)
Browse sedimentary (or mineraloid) specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Pink Opal
Hydrated Silicon Dioxide (SiO2 · nH2O)
mineraloid
Black Opal
Hydrated Silica (SiO2·nH2O)
Mineraloid
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Opal (Precious Opal)
Hydrated Silica (SiO2·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
mineraloid
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Limonite (with Pyrite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Limonite (Ironstone) Concretion
FeO(OH)·nH2O (Hydrous ferric oxide)
sedimentary
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Black Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Precious Opal
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Common Opal (Potch)
Hydrated Silica (SiO2·nH2O)
mineral
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary