Quartzite
Quartzite (mostly SiO2)
Metamorphic
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Material) in the encyclopedia
View all →
Vesicular Rhyolite
Extrusive igneous rock (high-silica rhyolite)
igneous
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Quartzite
Quartzite
metamorphic
Marble
Recrystallized Calcite / Metamorphosed Limestone (CaCO3)
metamorphic
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert pebble
Microcrystalline silica (SiO2)
sedimentary
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Limestone
Calcitic Limestone (CaCO3)
sedimentary
Mottled gabbro or diorite pebble
Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite
igneous
Chrysotile Asbestos
Mg3Si2O5(OH)4
mineral
Mica Sand / Vermiculite
Phyllosilicate group (typically Biotite or Muscovite)
mineral
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Frosted Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Greenschist
Greenschist (chlorite schist)
metamorphic
Conglomerate
Conglomerate Rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Slate
Slate (Foliated metamorphic rock)
metamorphic
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous