Scoria (Lava Rock)
Scoria
igneous
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Cobble
Meta-quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Geodude
Geodude (Rock Pokémon: No. 74)
igneous
Unakite (bottom) and Sodalite (top)
Epidotized Granite (Unakite) and Sodium Aluminum Silicate Chloride (Sodalite)
metamorphic
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Apache Tear
Obsidian (Hydrated Silica / Amorphous Volcanic Glass)
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)
igneous
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Ironstone Concretion / Limonite Node
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O) with Goethite/Hematite
sedimentary
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous
Obsidian with Matrix
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Mahogany Obsidian
Volcanic Glass (Silicate: SiO2 + Fe2O3)
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Quartzite (Red Chert/Jasper-like)
Metamorphosed Quartzite with Hematite inclusions (SiO2 + Fe2O3)
metamorphic
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Siltstone
Siltstone (fine-grained clastic sedimentary rock)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Dalmatian Stone
Dalmatian Jasper (actually a Peralkaline Igneous Rock)
igneous
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Quartzite (Chert)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Serpentine (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Fuchsite Quartzite (Green Aventurine in raw form)
Metamorphic Quartzite (SiO2) with Mariposite/Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic