Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
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Yellow Aventurine
Quartzite with inclusions (SiO2)
metamorphic
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
meteorite
Iron Meteorite (likely Chondrite or weathered Iron-Nickel)
Meteorite (Fe-Ni alloy & silicates)
igneous
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Silicon Carbide (Carborundum)
Moissanite (SiC)
mineral
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)
igneous
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
igneous
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Tektite
Tektite (Amorphous silica rich glass)
mineral
Pyrite in Matrix (Commonly called Fool's Gold)
Iron Sulfide (FeS2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Pyrite Sun
Iron Sulfide (FeS2)
mineral
Ferro-slag (Leland Blue/Slag Glass)
Anthropogenic Vitreous Silica (Industrial Slag)
igneous
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Siltstone with iron staining
Siltstone (primarily SiO2 with FeO(OH) coatings)
sedimentary
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Iron Meteorite
Iron-Nickel Alloy (Kamacite and Taenite)
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Likely iron-rich rock or metallic mineral fragment
Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment
mineral
![Arfvedsonite (often mistakenly sold as Astrophyllite) (Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]) — mineral](https://media.rockidentification.com/6e8b521a-e0bc-4cec-8657-2fd2e3051a43-thumbnail.jpg)
Arfvedsonite (often mistakenly sold as Astrophyllite)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]
mineral
Sodalite in Matrix (often called Blue Marble or Sodalite-Syenite)
Sodalite-bearing Syenite / Na8Al6Si6O24Cl2 (Sodalite component)
igneous
Iron meteorite (probable)
Fe–Ni metallic meteorite, commonly kamacite–taenite
meteorite
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary