Limonite (Iron-rich Gossan/Laterite)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Mahogany Obsidian
Volcanic Glass (Silicate: SiO2 + Fe2O3)
igneous
Plastic Building Toy (Lego-style piece)
Acrylonitrile Butadiene Styrene (ABS)
not a rock/mineral
Obsidian
Amorphous volcanic glass (principally SiO2)
igneous
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Opalite
Synthetic glass / Opalized glass
gemstone
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2-rich glass)
Igneous
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Obsidian
Volcanic Glass (Mainly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
sedimentary
Limonite or Ironstone Nodule
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
sedimentary
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Amber
Succinates (C10H16O)
mineraloid
Amber (Baltic)
Succinith (Fossilized Tree Resin)
mineraloid
Coal (Anthracite)
Anthracite coal (Carbon C)
sedimentary
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (Organic Gemstone)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
igneous
Amber
Succinite (approximate formula C10H16O)
mineral
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Amber
Succinite (C10H16O)
mineral
Coarse Sand or Fine Gravel
Clastic Sediment (unconsolidated)
sedimentary
Limonite (Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Byproduct)
mineraloid
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous