Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Igneous
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Limestone (specifically Bituminous or Carbonaceous Limestone)
Calcium Carbonate (CaCO3) with Organic Impurities
sedimentary
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variation)
Chert (SiO2)
sedimentary
Chert (often called Jasper in this color)
Microcrystalline quartz (SiO2)
sedimentary
Rough Quartz (or Quartzite pebble)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
sedimentary or metamorphic
Septarian Nodule
Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony in Matrix
Silicon Dioxide (SiO2)
mineral
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Chert (specifically Jasper or Flint type)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (specifically Milky/Gray Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Jasper / Chert (River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ferruginous Chert (Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chert (White/Gray variety)
Chert (SiO2)
sedimentary
Oolite (Ooid Limestone)
Ooidal Limestone (comprised of CaCO3)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Banded Chert
Microcrystalline silicon dioxide (SiO2)
sedimentary
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Laterite
Laterite (Iron/Aluminum-rich oxide)
sedimentary
Yellow Jasper
SiO2 (Silicon Dioxide)
sedimentary
Barite Rose (Desert Rose)
Barium Sulfate (BaSO4)
mineral