Gneiss
Gneiss
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Gneiss
Gneiss
Gneiss
Gneiss (High-grade metamorphic rock)
Gneiss
Gneiss
Gneiss (Banded Gneiss)
Gneiss
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Pink Granite Gneiss
Granitic Gneiss
Banded Gneiss
Gneiss
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
Schist
Mica Schist
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
Gneiss
Gneiss
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
Gneiss (Schistose)
Gneiss
Mica Schist with Iron Staining
Muscovite/Biotite Schist
White Marble
Metamorphosed Limestone (principally CaCO3)
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Gneiss
Gneiss
River Quartzite / Tumble-Polished Quartz
Quartzite (SiO2)
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Quartz Vein with Host Rock (Greywacke/Siltstone)
Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
Mica (Lepidolite or Muscovite)
Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
Magnetite-rich Iron Ore
Magnetite (Fe3O4)
Anthracite Coal
Anthracite (Carbon based)
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
Graphite
Graphite (Native Carbon, C)
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
Jasper (Green Jasper / Moss Agate variety)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Orange Calcite (Cleavage Rhomb)
Calcite (Calcium Carbonate, CaCO3)
Pyrite
Iron Sulfide (FeS2)
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
Magnetite
Magnetite (Fe3O4)
Hematite
Iron(III) oxide (Fe2O3)
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)