Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Quartz-rich hydrothermal specimen, likely milky quartz with calcite
Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining
mineral
Black Jasper
Silicon dioxide (SiO2)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Rounded pink granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed primarily of quartz, feldspar, and minor mica or amphibole
igneous
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Likely flint/chert fragments
Microcrystalline quartz (SiO₂), possibly fossil-bearing chert
sedimentary
Polished turquoise sphere with purple matrix/inclusion
Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Chalcedony / milky quartz flake
Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment
mineral
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Flint or chert
Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Reddish sandstone fragment
Quartz-rich sandstone (likely iron-oxide stained; exact composition cannot be confirmed visually)
sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Chert (Nodule)
Chert (variety of microcrystalline quartz, SiO2)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Quartz vein in weathered host rock
Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix
mineral
Flint or chert projectile point
Microcrystalline quartz (SiO₂), likely chalcedony-rich chert
sedimentary
Flint or chert flake/tool
Microcrystalline quartz (chalcedony), SiO₂
sedimentary
Gold
Gold (Native Au)
mineral
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Mixed gravelly conglomeratic road aggregate
Polymictic clast-supported conglomerate or fill; composition varies, commonly quartz, feldspar, basalt, and weathered rock fragments
sedimentary
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Black Onyx
Black Chalcedony (SiO2)
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Red Jasper (River Siltstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Jasper with Iron Staining
Silicon Dioxide (SiO2) with impurities
sedimentary