Weathered Sedimentary Rock with Liesegang Rings
Sandstone or Siltstone with Iron Oxide Banding
sedimentary
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 →
Sulfur
Native Sulfur (S8)
mineral
Agate Nodule (partially vuggy Quartz)
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Granite / Diorite (Granitic Pebble)
Intrusive Felsic/Intermediate Igneous Rock
igneous
Blue-green mineral specimen, likely chrysocolla or turquoise
Chrysocolla: hydrated copper phyllosilicate, approximately Cu₂H₂O₅Si; Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Ironstone Matrix with Jasper / Chert
Ferruginous Chert / Limonitic Jasper (SiO2 with Fe-oxides)
sedimentary
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Carnelian
SiO2 (Silicon Dioxide, variety of Chalcedony)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Jasper or Chert with Quartz Vugs
Silicon Dioxide (SiO2)
sedimentary
Agate (translucent water-worn pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Lace Agate
Microcrystalline Quartz (Chalcedony), SiO2
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Specular Hematite (Specularite) in Matrix
Specularite (Fe2O3)
mineral
Gold
Gold (Native Element); Au
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Gold Nugget
Native Gold (Au)
mineral
Conglomerate Pebble (with Chert / Quartz)
Sedimentary Conglomerate / Breccia Pebble
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (Carnelian/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Chert (with Quartz vein)
Chert (Silicon Dioxide, SiO2)
sedimentary
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary