Chert / Jasper
Silicon Dioxide (SiO2)
Category
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Chert / Jasper
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Jasper
Silicon dioxide (SiO2)
Banded Gneiss
Metamorphic Gneiss (High-grade regional metamorphism specimen)
Black Limestone with Calcite Veining
Limestone (CaCO3) with Calcite (CaCO3) inclusions
Sandstone
Arenite (SiO2 principal)
Sandstone Concretion
Limonitic Sandstone Concretion
Orange Calcite
Calcium Carbonate (CaCO3)
Gneiss (with Quartzite and Mica)
Gneiss
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
Red Sandstone
Arenite (Ferruginous Sandstone)
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
Petrified Wood
Silicified wood (SiO2)
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
Pyrite
Iron Sulfide (FeS2)
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
Gneiss
Gneiss (High-grade metamorphic rock)
Almandine Garnet
Almandine (Fe3Al2Si3O12)
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
Otodus Shark Tooth
Otodus obliquus
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
Fossiliferous Chert (Brachiopod/Bryozoan Fossil)
Microcrystalline quartz (SiO2) with fossil inclusions
Flint / Chert Pebble
Cryptocrystalline quartz (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert Nodule in Limestone
Microcrystalline Quartz (SiO2)
Chert (Sea-worn Pebble)
Microcrystalline Quartz (SiO2)
Chert Nodule
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
Aragonite (variety 'Flos Ferri')
Aragonite (CaCO3)
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Flint / Chert
Silicon dioxide (SiO2)
Flint / Chert (or fossiliferous nodule)
Microcrystalline quartz (SiO2)
Chert (Jasper/Pink Chert)
Silicon Dioxide (SiO2)
Chert pebble
Microcrystalline silica (SiO2)