Banded Iron Formation (BIF)
Banded Iron Formation (SiO2 + Fe2O3/Fe3O4)
sedimentary
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Goethite/Limonite Iron Ore Node
Goethite (FeO(OH)) or Limonite (mixture of hydrated iron oxides)
mineral
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Azurite-Malachite with Limonite
Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Pearl
Calcium carbonate (CaCO3) - Aragonite/Calcite variety
mineral
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Banded Chert (or Banded Jasper)
Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite/Goethite)
sedimentary
Fluorite (Green)
Fluorite (Calcium Fluoride, CaF2)
mineral
Prehnite on Basalt
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Malachite
Copper(II) carbonate hydroxide, Cu2CO3(OH)2
mineral
Chrysocolla
Chrysocolla - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Red Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Botryoidal Chalcedony (Agate/Chert Nodule)
Chalcedony (SiO2)
mineral
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Specular Hematite Geode/Nodule
Specularite (Polycrystalline Hematite), Fe2O3
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Jasper
Quartz (Silicon Dioxide) with Iron Oxide impurities (Fe2O3)
mineralological specimen
Ferruginous Sandstone (Gozzan/Ironstone)
Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary
Graywacke (River Cobble)
Graywacke (Lithic Sandstone)
sedimentary
Coquina
Coquina (a type of limestone)
Sedimentary
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary