Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Category
Browse mineral_rock specimens identified by the Rock Identifier community.
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Quartz Geode
Silicon Dioxide (SiO2) in a concretion
Jasper Beads (Polished)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Shale
Laminated Mudstone
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Sandstone
Arenite (mostly SiO2)
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
Granodiorite / Granite (Weathered)
Granodiorite
Sandstone
Arenite (SiO2 principal)
Sandstone
Arenite (SiO2 primarily)
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
Quartz pebble
Silicon dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Raw Calcite
Calcite (Calcium Carbonate - CaCO3)
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
Malachite
Copper carbonate hydroxide [Cu2CO3(OH)2]
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Quartz (Small Grains)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Rhodochrosite
Manganese Carbonate (MnCO3)
Pyrite
Iron Sulfide (FeS2)
Lapis Lazuli
Lapis Lazuli (Complex rock mainly composed of Lazurite, Calcite, and Pyrite)
Pyrite
Iron Pyrite (FeS2)
Pyrite
Iron Sulfide (FeS2)
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
Quartz
Silicon Dioxide (SiO2)
Schist
Mica Schist
Quartz Pebble
Silicon Dioxide (SiO2)
Concretion
Calcareous/Siliceous Concretion
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
Dark fine-grained river pebble, likely basalt or diabase
Basaltic rock; chiefly plagioclase feldspar and pyroxene, with possible magnetite
K-Feldspar / Granite Pegmatite
Potassium Feldspar (Microcline/Orthoclase) with Quartz
Clear Quartz Point
Silicon Dioxide (SiO2)
Quartz Pebbles
Silicon Dioxide (SiO2)
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite and Calcite inclusions
Quartz Crystal Point
Silicon Dioxide (SiO2)
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)