Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2)
igneous
Anthracite Coal
Anthracite (Carbon based)
metamorphic
Amber
Succinite (C10H16O)
mineral
Amber
Succinicum (Formula: C10H16O)
Mineraloid
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
igneous
Anthracite
Anthracite Coal
metamorphic
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Obsidian (specifically Rainbow or Silver Sheen Obsidian)
Volcanic Glass (predominantly SiO2)
Igneous
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Laterite
Lateritic Soil/Rock (rich in Fe2O3 and Al2O3)
sedimentary
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Ironstone Pebble
Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Black Opal
Hydrated Silica (SiO2·nH2O)
Mineraloid
Amber
Succinite (a fossilized organic resin)
mineral
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Organic Gemstone (Mineraloid)
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Amber
Succinicum (Succinite); C10H16O
Mineraloid (Organic)
Limonite (with Goethite/Ironstone)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Amber
Succinite (organic hydrocarbon)
mineraloid
Gold Nugget
Native Gold (Au)
mineral
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Anthracite Coal
Anthracite (Carbon Content 86–97%)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Black Obsidian with white veins
Volcanic Glass (70–75% SiO2)
igneous
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Obsidian
Volcanic glass (no mineral formula due to amorphous structure, mostly SiO2)
igneous
Tektite (Indochinite)
Tektite (Amorphous Silica Glass), SiO2(Al2O3)
igneous
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various metal oxide impurities
Man-made material (Anthro-lithic product)
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)