Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
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
View all →
Banded Sedimentary Rock
Sedimentary Rock with Quartz/Feldspar Vein
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
sedimentary
Hematite
Iron(III) oxide, Fe2O3
mineral
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Azurite Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
mineral
Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Hematite (Botryoidal / Kidney Ore)
Iron Oxide (Fe2O3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Quartz Geode with Calcite/Siderite
Crystalline Silicon Dioxide (SiO2) with Carbonate inclusions
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
sedimentary
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Limonite or Ironstone Nodule
Hydrated iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Limonite Nodule
FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)
mineral
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Mineral
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Gold Nugget
Native Gold (Au)
mineral
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Botryoidal hematite (ironstone)
Hematite, Fe₂O₃; likely a botryoidal or massive iron-oxide specimen
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Chalcedony
Chalcedony (SiO2)
mineral
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Weathered river cobble, possibly sandstone or volcanic tuff
Indeterminate lithology; likely fine-grained sandstone/siltstone, with possible iron-oxide veining
sedimentary