Gneiss
Gneiss
metamorphic
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3
mineral
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Flint (variety of Chert)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Ferruginous Sandstone (Gozzan-like)
Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)
sedimentary
Gneiss
Gneiss
metamorphic
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Fossiliferous Chert (Chert with Crinoid Stem Impression)
Chert (SiO2) with fossil Anthozoan or Crinoid columnals
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Black Chert)
Microcrystalline Silica (SiO2)
sedimentary
Chert (and Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Oolitic Limestone / Fossiliferous Chert
Oolitic Limestone (CaCO3) / Silicified Limestone
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Jasper
Chalcedony (cryptocrystalline quartz), SiO2
Sedimentary
Gneiss
Gneiss
metamorphic
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary