Bumble Bee Jasper
Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
View all →
Obsidian
Volcanic Glass (SiO2)
igneous
Quartz Sand/Gravel
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Oolitic Limestone
Oolite (Sedimentary Calcium Carbonate)
sedimentary
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Amber
Succinite (fossilized tree resin)
mineraloid
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Green Opal
Opal (Hydrated silica, SiO2·nH2O)
mineral
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Dragon's Breath (Mexican Opal Glass)
Artisan Foil Glass (SiO2 based)
mineraloid
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Red Coral
Corallium rubrum
mineral
Slag Glass
Glassy Silicate Residue
industrial byproduct
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Obsidian
Obsidian (volcanic glass), amorphous SiO2 + impurities
igneous
Gold Sheen Obsidian
Volcanic Glass (Amorphous Silica with Magnetite inclusions)
igneous
Obsidian (Arrowhead Lithic Tool)
Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)
igneous
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
sedimentary
Tektite (Indochinite)
Tektite (High-silica amorphous glass)
igneous
Pink Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Common Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Obsidian (Apache Tear)
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Precious Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Common Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral