Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Processed Mineral Product) in the encyclopedia
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Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Conglomeratic gravel / polymictic breccia
Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies
sedimentary
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Mixed mineral and rock specimen collection
Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image
mineral
Metallic sulfide mineral specimen, likely pyrite
Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate
mineral
Unknown dark mineral fragment
Indeterminate; possibly a dark silicate mineral or slag-like geological fragment
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Crushed Limestone and Calcite
Calcium Carbonate (CaCO3)
sedimentary
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Serpentine
Serpentinite (composed primarily of Mg3Si2O5(OH)4)
metamorphic
Amethyst Cluster Pendant
Silicon Dioxide (SiO2) - Quartz variety Amethyst
gemstone
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Unable to identify - Image contains non-geological items
N/A
Toast
Triticum aestivum (processed)
not a geological specimen
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Mixed Mineral Collection (with Titanium Aura Quartz)
Silicon Dioxide (SiO2) with metallic coatings and various silicates
mineral
Small weathered rock fragment
Indeterminate; possibly limestone or altered volcanic rock
sedimentary
Dyed Pink Agate (Crackled)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Hematite (Specularite)
Fe2O3 (Iron(III) oxide)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Botryoidal Hematite (Iron Stone Conglomerate)
Hematite (Fe2O3) in sedimentary matrix
sedimentary
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Asphalt
Asphalt concrete
sedimentary
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Pyrite-bearing rock, likely quartz vein
Pyrite (FeS₂) in quartz-rich host rock
mineral
Polished banded calcite (often sold as “onyx marble” or Mexican onyx)
Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite
sedimentary
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Carved pyrite frog or toad
Pyrite (iron disulfide, FeS₂), likely a carved massive aggregate
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral