Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Weathered basaltic river pebble
Basalt, likely altered or partially vesicular basalt
igneous
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Ferruginous Quartz (Stained Quartz)
Silicon Dioxide (SiO2) with secondary Iron Oxide inclusions (Limonite/Hematite)
mineral
Basalt with Quartz Vein
Basalt (Mafic Extrusive Igneous Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
metamorphic
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Fluorite (Green)
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chrysocolla (on host rock)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)
mineral
K2 Jasper (K2 Stone)
Azurite in Granite / Quartzite
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Botryoidal Hematite (included in Quartz/Limonite matrix)
Fe2O3 (Hematite) on Quartz (SiO2) / Limonite
mineral
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Clear Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Garnet Gneiss or Mica Schist with Garnet
Almandine Garnet-bearing Gneiss
metamorphic
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Quartz-veined Gneiss
Gneiss with Quartz (SiO2) intrusions
metamorphic
Schist
Mica Schist
metamorphic