Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)
Metamorphic Rock / Mineral
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Gneiss (River Cobble)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
igneous
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).
Mineral
Limonite Concretion
Goethite-rich Concretion (FeO(OH))
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Mineral/Rock (Extraterrestrial Origin)
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Iron-stained Quartz (Gossan/Limonite-coated Quartz)
Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Greenschist
Chlorite schist
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Granite
Granite (composed primarily of Quartz SiO2 and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8))
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lazurite-dominant Metamorphic Rock (complex aluminosilicate)
metamorphic
Basalt with Epidote/Chlorite
Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))
igneous
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Green Aventurine
Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral