Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Category
Mineral Health
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Quartz Pebble (with Mica or Iron staining)
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Desert Rose (Sand Barite/Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a nodule
sedimentary
Basalt-Amugydule (Amygdaloidal Basalt)
Aphanitic Mafic Igneous Rock with Vesicle Infillings
igneous
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Desert Rose (Gypsum/Baryte)
Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Sandstone (likely River-tumbled Picture Sandstone)
Arenite (predominantly SiO2 with iron oxide impurities)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral