Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Category
Sedimentary (Man Made Composite)
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Quartzite River Stone
Quartzite (primarily SiO2)
metamorphic
Precious Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (composed primarily of Fluorapatite)
mineral
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chalcedony (specifically Common Opal or Agate variant)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Halite (Rock Salt)
Halite (NaCl)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian (Carnelian Agate)
Silicon dioxide (SiO2) - a variety of Chalcedony
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Mineral