Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Micro-Meteorite (Micrometeoroid)
Extraterrestrial Spherule (Silicate or Iron-Nickel)
mineral
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Ferruginous Sandstone with Ironstone Concretion
Goethite-rich Sandstone (FeO(OH))
sedimentary
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Obsidian
Obsidian (principally SiO2)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Amber
(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.
Mineral
Blue Goldstone
Man-made glass with suspended copper, cobalt, or manganese particles
man-made glass
Hag Stone
Perforated Sedimentary Rock / Flint / Limestone
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pumice
Pumice (Volcanic Glass Foam)
igneous
Goldstone and pink quartz bead strands
Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible
mineral
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Coprolite
Fossilized Feces
fossil
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Petrified Wood
Silicified wood (Quartz replacement)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (SiO2)
igneous
Jasper and Agate Beads (Mahogany Obsidian, Dyed Agate, Turquoise/African Turquoise)
Silicon Dioxide (SiO2) mixture with inclusions / Hydrated Copper Aluminum Phosphate
gemstone
Ironstone Concretion / Limonite Node
Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)
sedimentary
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Pumice
Vesicular Rhyolite / Glassy Igneous Rock
igneous
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Pumice
Pumice (Vesicular felsic extrusive igneous rock)
igneous
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Scoria (Lava Rock)
Scoria
igneous
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Limestone
Sedimentary Rock (Primarily Calcium Carbonate, CaCO3)
sedimentary
Pumice
Pumice (Felsic volcanic glass)
igneous
Pumice
Pumice (Volcanic glass / Felsic igneous rock)
igneous
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral