Riverstone Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Quartz / Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Garnet (specifically Almandine or Pyrope)
Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)
mineral
Agate
Agate (Cryptocrystalline Variety of Quartz, SiO2)
Mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Pink Himalayan Salt (Halite)
Halite - NaCl (Sodium Chloride) with trace Iron Oxide and Magnesium
Mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Granite
Granite (a felsic intrusive igneous rock)
igneous
Scoria (with Iron Oxidation)
Vesicular Basalt / Scoria
igneous
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper River Stone
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
sedimentary
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Olivine (Peridot in gem form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Mahogany Obsidian
Obsidian (SiO2 + Fe2O3)
igneous
Smoky Quartz (with possible Feldspar inclusions)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (River Cobble)
Quartzite (predominantly SiO2)
metamorphic
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Basalt
Mafic Extrusive Igneous Rock
Igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary