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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Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Kyanite
Kyanite (Al2SiO5)
mineral
Pale green translucent mineral fragment
Indeterminate; possibly fluorite, calcite, or glassy quartz
mineral
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Likely pyrite-bearing rock or pyrite fragment
Pyrite (FeS₂), possibly mixed with quartz or carbonate matrix
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Turquoise-style beaded bracelet
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads
mineral
Hematite
Hematite (Fe2O3)
mineral
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral
Earthy iron-rich clay or weathered laterite
Hydrated iron oxides and clay minerals, commonly goethite/hematite with kaolinite or illite
sedimentary
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Hematite (Concretion)
Iron(III) oxide (Fe2O3)
mineral
Beach Agate / Chalcedony Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Slate
Slate (foliated metamorphic rock)
metamorphic
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Black Obsidian
Extrusive Volcanic Glass (primarily SiO2)
igneous
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Slate
Foliated Metamorphic Slate
metamorphic
Small white mineral fragment
Likely quartz (SiO₂), possibly calcite (CaCO₃)
mineral
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Botryoidal hematite (ironstone)
Hematite, α-Fe₂O₃, likely with goethite and iron-rich matrix
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Petrified Coral (Agatized Coral)
Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)
fossil
Quartz Geode or Druzy Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Small tumbled quartz-like pebble
Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar
mineral
Chrysocolla-bearing copper ore
Chrysocolla (hydrated copper aluminum silicate), likely with malachite/azurite and copper sulfides
mineral
Red Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Sandstone / Weathered Chert
Silicon Dioxide (SiO2) / Quartz-rich Clastic Rock
sedimentary
Red jasper (tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides
mineral