Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Category
Mineral (Sedimentary Context)
Browse mineral (sedimentary context) specimens identified by the Rock Identifier community.
Learn about Mineral (Sedimentary Context) in the encyclopedia
View all →
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Chert (Flint) Artifact
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz Sandstone)
sedimentary
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Glauconitic Sandstone (or Greenstone)
Glauconitic Sandstone with Quartz
sedimentary
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Fossil bivalve shell
Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image
fossil
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Coprolite
Fossilized Feces
fossil
Chert (Cream Variety)
Microcrystalline silica (SiO2)
sedimentary
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Chert / Flint (Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Chert / Flint Tool
Cryptocrystalline quartz (SiO2)
sedimentary
Chert / Flint Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Sandstone (Water-worn Cobble)
Arenite (variable composition, primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Rounded gray stone, likely quartz-rich granitic rock
Probable granite or granitic gneiss; mainly quartz, feldspar, and mica
igneous
Black Jasper
Silicon dioxide (SiO2) with carbon/mineral inclusions
sedimentary
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Ferruginous Sandstone (Quartz Arenite with Iron Oxide cement)
sedimentary
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary