Gneiss
Gneiss
Category
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
Gneiss
Gneiss
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Jasper
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Pink Opal
Hydrated Silica (SiO2·nH2O)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Ruby in Zoisite
Anyolite (composite of Corundum Al2O3 and Zoisite Ca2Al3(SiO4)(Si2O7)O(OH))
Chert (Flint)
Silicon Dioxide (SiO2)
Chert / Chalcedony Nodules
Silicon Dioxide (SiO2)
Tiger's Eye
SiO2 (Silicon Dioxide)
Potassium Feldspar
Orthoclase (KAlSi3O8)
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
Jasper
Silicon dioxide (SiO2) with impurities
Quartz Pebble
Silicon Dioxide (SiO2)
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
Pyrite
Iron Sulfide (FeS2)
Chert / Jasper
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Quartz
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon dioxide (SiO2)
Chert (Flint)
Chert (SiO2)
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
Chert / Flint
Silicon Dioxide (SiO2)
Chert (Flint)
Chert (SiO2)
Hematite
Hematite (Fe2O3)
Ironstone Concretions (Ironstone)
Ferruginous Sandstone or Siltstone (Fe2O3)
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
Quartz (Milky/Rose Quartz variety)
Silicon Dioxide (SiO2)
Hematite
Iron(III) oxide (Fe2O3)
Fluorite
Calcium Fluoride (CaF2)
Celestite (Celestine)
Strontium sulfate (SrSO4)
Pyrite
Iron Sulfide (FeS2)
Carnelian
Carnelian (Silicon Dioxide - SiO2)
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
Chert (specifically Flint)
Chert (SiO2)
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)