Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Bumblebee Jasper
Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)
igneous
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Limonite Geode (Ironstone Concretion)
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Limonite (with Pyrite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Obsidian (Black Obsidian)
Obsidian (Volcanic Glass)
igneous
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2 + tracing minerals
mineraloid / impactite
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian (Polished Cabochon)
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Limonite (Iron Stone/Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Mahogany Obsidian
Volcanic Glass (Amorphous Silicon Dioxide with Hematite inclusions)
igneous
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Opalite
Synthetic Opalite (Man-made glass)
mineral
Scoria (Red Lava Rock)
Extrusive Vesicular Basalt / Andesite
igneous
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide SiO2)
Igneous
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 rich)
igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Opalite
Synthetic Opalized Glass
mineraloid (man-made)