Industrial By Product

Slag (Industrial By-product)

Glassy silicate or metallic smelting residue

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Slag

Slag (Industrial)

N/A (Anthropogenic Slag)

Opalite

Man-made glass (traditionally simulated Opal)

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag

Likely graphite-rich schist or graphite-bearing metamorphic rock

Graphite (C) in a mica/quartz-rich matrix; exact rock name requires testing

Botryoidal chalcedony (agate/geode fragment)

Chalcedony, microcrystalline SiO₂; likely quartz with minor iron-oxide and carbonate inclusions

Flesh-colored Quartzite

Quartzite (SiO2)

Quartzite cobblestone

Quartzite (primarily SiO2)

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Quartz-rich pegmatite with iron-stained quartz

Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining

Small tumbled quartz-like pebble

Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar

Possible meteorite fragment

Undetermined; likely an iron-rich meteorite or meteorite-like slag fragment

Yellow calcite crystal

Calcite (CaCO₃), likely honey/yellow calcite

Quartzite

Quartzite (composed primarily of SiO2)

Polished black stone, likely shungite

Shungite; carbon-rich mineraloid composed mainly of amorphous carbon, with silica and other minerals

Blue calcite cluster

Calcite (calcium carbonate, CaCO₃)

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

Galena

Galena (lead sulfide, PbS)

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Galena

Galena (lead sulfide, PbS)

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

N/A (Non-Geological Object)

The user-provided image does not contain a rock or mineral specimen

Slag

Metallurgical by-product

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Iron Slag

Anthropogenic Iron Silicate

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Iron Slag

Anthropogenic pyrometallurgical byproduct

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Milky quartz pebble

Quartz, SiO₂ (microcrystalline to crystalline variety)

Smelter Slag

Anthropogenic Silicate Slag

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Banded Iron Formation (BIF)

Banded Iron Formation (Magnetite-Hematite-Chert)