Magnetite
Magnetite (Fe3O4)
mineral
Category
Organic (Sedimentary Context)
Browse organic (sedimentary context) specimens identified by the Rock Identifier community.
Learn about Organic (Sedimentary Context) in the encyclopedia
View all →
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Rhodonite with Manganese Oxides
Rhodonite (Mn,Fe,Mg,Ca)SiO3
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
White Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Chalcedony (Silicon Dioxide with Iron inclusions), SiO2
sedimentary
Yellow Jasper
Chalcedony (Silicon Dioxide with iron inclusions), SiO2
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Red Jasper
Jasper (Silicon Dioxide) - SiO2
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Specular Hematite (Iron Ore)
Hematite (Alpha-Fe2O3)
mineral
Magnetite Ore
Magnetite (Fe3O4)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary