Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Mineral, Often Found As A Rock (Metamorphic)
Browse mineral, often found as a rock (metamorphic) specimens identified by the Rock Identifier community.
Learn about Mineral, Often Found As A Rock (Metamorphic) in the encyclopedia
View all →
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Quartzite
Quartzite (primarily SiO2 with chlorite inclusions)
metamorphic
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Serpentine
Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4
metamorphic
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities
sedimentary
Milky Quartz Pebble with Matrix
Quartz (SiO2)
mineral
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Gold Ore
Native Gold (Au) in Matrix
mineral
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
River Rock (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneiss)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Chert (Basanite variety) with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Ruby in Zoisite with Hornblende
Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
Metamorphic Rock / Mineral Association
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock with Dendrites
Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions
metamorphic
Schist
Chlorite or Mica Schist
metamorphic
Carnelian Agate
Carnelian (Chalcedony / Silicon Dioxide SiO2)
mineral
Agate Geode
Chalcedony (cryptocrystalline SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary