Ironstone (Limonite/Hematite concretion)
Ferruginous Siltstone / Goethite (FeO(OH))
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Limonite with Goethite
Iron Hydroxide Mixture (FeO(OH)·nH2O)
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Obsidian with Mahogany Phasing
Volcanic Glass (SiO2 + Fe2O3)
igneous
Chrysocolla
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)
mineral
Shungite
Non-crystalline carbon (high-carbon metamorphic rock)
metamorphic
Limonite (Ironstone)
FeO(OH)·nH2O (Hydrous ferric oxides)
mineral
Amber
Succinite (with various hydrocarbon compositions)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineraloid
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Amber
Succinite (C10H16O)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Snowflake Obsidian (Tumbled)
Obsidian with Cristobalite inclusions
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Coal (Anthracite)
Anthracite Coal (C)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Amber (in Matrix/Shale)
Amber (Fossilized Tree Resin)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Amber
Succinates (Organic Gemstone)
mineral
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)