Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
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.
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Obsidian
Obsidian (Volcanic Glass)
igneous
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Bismuth
Bismuth (Bi)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Gold
Native Gold (Au)
mineral
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Chert (Arrowhead Debitage or Spall)
Silicon Dioxide (SiO₂)
sedimentary
Tiffany Stone
Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
metamorphic
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
sedimentary
Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Obsidian
Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)
Igneous
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
metamorphic