Yellow Ochre / Limonite
Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
igneous
Amber
Succinates (Organic Fossilized Resin)
mineraloid
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Obsidian (Apache Tear)
Volcanic Glass (High-silica Rhyolite)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Opal ring
Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2-rich glass)
Igneous
Limonite (Ironstone) pseudomorph
Limonite (Hydrous ferric oxide), FeO(OH)·nH2O
mineral
Amber (Copal)
Succiniferous Resin
mineraloid
Opalite
Synthetic Glass (Hydrated Silica Simulant)
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Amber (Copal)
Fossilized Tree Resin
mineraloid
Amber and Tumbled Stones
Fossilized Tree Resin (Succinite)
fossil
Amber
Succiniferous fossil resin (C10H16O)
fossil
Amber
Fossilized tree resin
gemstone
Amber
Succinate (Fossilized Resin)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite (SiO2)
igneous
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral
Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Coquina (Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Fulgurite
Lechatelierite (Silica Glass)
mineral
Porcelain (White Ceramic)
Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)
metamorphic
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Chert with Crinoid Fossil Impression
Microcrystalline Quartz (SiO2) with Crinoidea fossil impression
sedimentary
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Amber
Succinite
Organic Mineral
Amber
Amber (C10H16O)
mineral
Limonite (Iron-rich Gossan/Laterite)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral