Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Category
Mineral (Iron Ore)
Browse mineral (iron ore) specimens identified by the Rock Identifier community.
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Yellow Quartz (Citrinated Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Gold Nugget / Gold-bearing Quartz
Native Gold (Au)
mineral
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Tree Agate (also known as Dendritic Agate)
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Red Aventurine
Aventurine Quartz (SiO2 + Hematite/Goethite)
metamorphic
Ferruginous Chert (Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Basalt with Iron Oxidation
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral