Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Lapis Lazuli
Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite
metamorphic
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Agate
Silicon Dioxide (SiO2) - variety: Chalcedony
mineral
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Chert
Chert (microcrystalline quartz)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Granite
Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)
igneous
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Silver (Native Element)
Silver (Ag) in an alloy of 90% Silver and 10% Copper
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Chert (specifically Yellow/Common Opal or Jasper mixture)
Silicon Dioxide (SiO2)
sedimentary
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Gold Nugget
Native Gold (Au)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass