Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Mineral Formation) in the encyclopedia
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Fluorite Tower
Fluorite (Calcium Fluoride - CaF2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (primary component SiO2)
sedimentary
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Native Sulfur
Sulfur (S8)
mineral
Okenite
Okenite, Ca3Si6O15·6H2O
mineral
Quartz Geode / Druzy Quartz Node
Silicon Dioxide (SiO2)
sedimentary
Hematite (Nodular or Botryoidal)
Iron(III) oxide (Fe2O3)
mineral
Tumbled blue-green stone, likely chrysocolla-bearing material
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; identification is provisional from the photograph
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide, SiO2) Geode
sedimentary
Quartzite with Quartz Vein
Quartzite (SiO2)
metamorphic
Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely milky or partially included rock crystal
mineral
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Agate (Water-Worn Pebble)
Silicon Dioxide (SiO2) - Chalcedony
mineral
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Fluorite (tumbled pebble)
Calcium Fluoride (CaF2)
mineral
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2)
sedimentary
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Psilomelane (Black Hematite/Manganese Ore)
Barium Manganese Oxide (Formula: BaMn9O18(OH)4)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limestone with Calcite Veins
Calcium Carbonate (CaCO3) - Sparry Limestone
sedimentary
Malachite
Cu2CO3(OH)2 (Copper carbonate hydroxide)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral