Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
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Weathered jasper-rich ironstone
Brecciated jasper/chert with iron oxides and hydroxides (SiO₂ with hematite, goethite, and limonite)
sedimentary
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Dendritic Agate / Chalcedony
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Heulandite with Stilbite
Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
mineral
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)
Metamorphic rock / Mineral variety
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite / Goethite Ironstone Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Native Copper (in coinage alloy)
Copper (Cu)
mineral
Turquoise and Hematite
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3
mineral
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral
Specular Hematite with Quartz
Ferric oxide (Fe2O3) and Silicon dioxide (SiO2)
Mineral
Diamond
Carbon (C)
gemstone
Chert (with Quartz Veining)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Desert Rose (Baryte or Gypsum)
Barium sulfate (BaSO4) or Calcium sulfate dihydrate (CaSO4·2H2O)
sedimentary
Red Hematite (Banded Iron Formation)
Hematite (Fe2O3)
mineral
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Red Jasper
Silicon dioxide (SiO2)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Banded Chert or Agate
Silicon Dioxide (SiO2)
sedimentary
Vanadinite on Barite
Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise color-bead and Hematite necklace
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral