Basalt
Basalt (Mafic volcanic rock)
Category
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Basalt
Basalt (Mafic volcanic rock)
Diorite
Intermediate plutonic igneous rock
Granite
Granite (Felsic Plutonic Rock)
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
Chert
Chert (microcrystalline quartz)
Granite
Granite (Phaneritic igneous rock)
Granite Pebble
Felsic intrusive igneous rock
Granodiorite
Granodiorite
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Granite
Phaneritic Felsic Igneous Rock
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
Quartz
Silicon dioxide (SiO₂)
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Granite
Granitoid (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
Granite
Intrusive Igneous Rock (Granitic)
Basalt
Basalt (Mafic volcanic rock)
Basalt
Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
Sandstone
Arenite
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Granite
Phaneritic Plutonic Felsic Rock
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Slag
Ferrous Slag (Siliceous industrial waste)
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
Granite
Phaneritic Felsic Intrusive Igneous Rock
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)