Tufa
Calcareous Tufa (CaCO3)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Obsidian
Obsidian (principally SiO2 silicon dioxide)
igneous
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)
sedimentary
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Amber
Fossilized Tree Resin (Generic formula: C10H16O)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Puddingstone
Conglomerate (typically quartz-rich or jasper-rich)
sedimentary
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid
Fossiliferous Limestone (Chertified Limestone)
Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)
sedimentary
Basalt with Scoria and potential Olivine/Pyroxene inclusions
Vesicular Basalt
igneous
Amber
Succinite (Organic Mineraloid)
mineral
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Chemical composition: 70–75% SiO2 + MgO, Fe3O4)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)
igneous
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Chondrite Meteorite Fragment
Ordinary Chondrite (L or H type)
igneous
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Conglomerate with Quartzite Pebbles
Clastic sedimentary rock (Conglomerate)
sedimentary
Apache Tears (Obsidian)
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Anthracite Coal
Anthracite (Carbon Content: 86%–98%)
metamorphic
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Anthracite Coal
Coal (predominantly carbon)
sedimentary
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous