Pumice
Pumicite (Volcanic glass with vesicular texture)
igneous
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
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Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Native Copper
Copper (Cu)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Likely iron-rich rock or weathered metallic mineral fragment
Uncertain; possibly limonite/goethite or iron-bearing slag
mineral
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Mica Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2 / SiO2)
metamorphic
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Vesicular Basalt (or Scoria)
Extrusive mafic igneous rock
igneous
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Weathered, iron-stained quartz-rich pebble (uncertain identification)
Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions
mineral
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pumice
Pumice (a vesicular volcanic glass)
igneous
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Hematite
Iron Oxide (Fe2O3)
mineral
Red Claystone / Mudstone
Argillaceous sedimentary rock
sedimentary
Pumice
Pumicite / Vesicular Rhyolite
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Pumice
Pumiceous volcanic glass
igneous
Pumice
Pumicite
igneous
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Uncertain polymict breccia or altered volcanic rock
Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumicite / Vesicular Rhyolite
igneous
Pumice
Pumice (Highly vesicular felsic volcanic rock)
igneous