Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Category
Mineral (Sedimentary Context)
Browse mineral (sedimentary context) specimens identified by the Rock Identifier community.
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Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Chalcedony Geode / Agate Nodule
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Flint variety)
Microcrystalline context of Quartz (SiO2)
sedimentary
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) containing trace amounts of titanium, iron, or manganese
mineral
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Unidentified Rock Fragment
Unknown
Rock
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Mica Schist
Mica Schist (Quartz-Mica Schist)
metamorphic
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion (Moqui Marble)
Iron-oxide concretion (Fe2O3 / FeO(OH))
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite
Pyrite (FeS₂)
Mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus), composed of CaCO3 (Aragonite/Calcite)
fossil
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary