Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Tumbled tiger’s eye
Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Amethyst and mixed gemstone bracelet
Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
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N/A
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Sulfur
Native Sulfur (S)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Native Sulfur
Sulfur (S)
mineral
Purpurite
Purpurite (MnPO4)
mineral
Hematite
Ferric Oxide (Fe2O3)
mineral
Red Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Tumbled quartz (likely rose or milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Carborundum (Silicon Carbide)
Silicon carbide (SiC)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz-rich pegmatite with iron-stained quartz
Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining
igneous
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Polished red jasper beads
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
mineral