Hematite
Iron(III) oxide, Fe2O3
mineral
Category
Mineral (Sedimentary Context)
Browse mineral (sedimentary context) specimens identified by the Rock Identifier community.
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Gypsum (Alabaster variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
River Cobble (Sandstone)
Arenite (primarily SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Quartz Geode
Silicon Dioxide (SiO2) in Calcareous or Siliceous Matrix
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Bumblebee Jasper
Anhydrous Calcium Carbonate with Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Biotite-rich gneiss
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Likely mica schist
Mica-rich schist, probably muscovite–biotite schist
metamorphic
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded gneiss pebble
Gneiss, a foliated metamorphic rock, likely quartz–feldspar–mica gneiss
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Fossil oyster shell
Oyster (family Ostreidae), preserved as calcite/aragonite shell
fossil
Polished brecciated jasper (likely picture jasper)
Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions
metamorphic
Limonite
FeO(OH)•nH2O
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Limonite with Quartz
Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)
mineral
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
mineral
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Polished banded gneiss pebble
Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image
metamorphic
Iron-rich concretion or weathered ironstone
Limonite/goethite-rich ironstone; commonly hydrated iron oxides (FeO(OH)·nH₂O)
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Zebra Jasper
Silicified sedimentary rock (SiO2) with mineral inclusions
sedimentary