Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Specular Hematite
Hematite (Fe2O3)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Pyrite (Limonite Pseudo-morph after Pyrite)
Iron sulfide (FeS2) transitioning to Iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Jasper (likely river-tumbled)
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary (microcrystalline silicate)
Limonitic Quartzite
Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining
metamorphic
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Fluorite
Calcium fluoride (CaF2)
mineral
Milky or Greenish Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Oxides
Silicon Dioxide (SiO2)
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Red Jasper with Quartz veins
Jasper (Silicon Dioxide, SiO2) with macrocrystalline Quartz veins
sedimentary
Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Granite River Cobble
Granitoid (comprising Quartz, Feldspar, and Mica)
igneous
Granite Pebble on Flagstone
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Basalt pebble
Basalt
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
sedimentary
Prasiolite
Silicon Dioxide (SiO2) with iron impurities
mineral
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Iron-Stained Quartz Pebble
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions
mineral
Chert (specifically a Worked Flint/Knapped Flake)
Chert / Flint (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Basalt with Vesicles
Vesicular Basalt
Igneous
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Granite Cobble
Granitoid
igneous
Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Milky Quartz (Water-Worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
mineral