Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
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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Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Fluorite
Calcium fluoride (CaF2)
mineral
Slag
industrial by-product
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
Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
igneous
Rounded metallic-looking pebble, likely iron-rich rock or slag
Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag
mineral
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Fluorite, Sodalite, and Rose Quartz collection
Calcium Fluoride (CaF2), Sodium Aluminum Silicate with Chlorine (Na8(Al6Si6O24)Cl2), Silicon Dioxide (SiO2)
mineral
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Bismuth
Bismuth (Bi)
mineral
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Chalcanthite
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Silicon (Industrial Grade)
Elemental Silicon (Si)
mineral
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Gold
Native Gold (Au)
mineral
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Chert (Arrowhead Debitage or Spall)
Silicon Dioxide (SiO₂)
sedimentary
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Tiffany Stone
Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2
mineral