Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Milky Quartz with Iron Oxide Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Crushed Stone (Likely Granite or Diabase)
Intrusive Igneous Rock (Granitoid/Gabbroid)
igneous
Rough Tanzanite
Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Graphite
Graphite (C)
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Quartzite (specifically an iron-stained or Carnelian-colored variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Nephrite Jade (River Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Emerald (Beryl)
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Chert / Quartz Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Scoria (Vesicular Basalt)
Vesicular Basalt
igneous
Chert (and associated Sedimentary rocks)
Microcrystalline Silica (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO₂)
Mineral
Eclogite
Eclogite (Omphacite + Almandine-Pyrope Garnet)
metamorphic
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Basalt with Quartz Vein
Basalt (SiO2 vein inclusion)
igneous
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium)
mineral
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary