Polished malachite slab
Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized
Category
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
Polished malachite slab
Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
Sandstone
Arenite (with iron oxide cement)
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Corundum
Corundum (Aluminium oxide, Al2O3)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Calcite
Calcite (Mineral; CaCO₃)
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
Diamond
Diamond (pure Carbon, C)
Granite or granitic gneiss pebble
Felsic granitoid, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph
Green Schist
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
Quartzite
Quartzite (SiO2)
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Diamond
Carbon (C)
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
Banded Gneiss
Gneiss (variable mineral composition)
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Sandstone
Arenite (SiO2 primarily)
Chalk
Carbonate rock (mainly CaCO3)
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
Diamond (in Jewelry)
Carbon (C)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Sandstone pebble
Sandstone (arenite / quartzarenite)
Greenschist
Chlorite schist
Garnet Schist
Almandine-Garnet Mica Schist
Calcite
Calcite (Calcium Carbonate, CaCO3)
Pearl
Aragonite / Calcium Carbonate (CaCO3)
Sandstone
Arenite (SiO2 composition dominant)
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
Chert (Flint)
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Diorite
Diorite (Intermediate intrusive igneous rock)
Diamond
Native Carbon (C)
Diamond
Carbon (C)
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
Rose Quartz
Rose Quartz (SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Pearl
Organic gemstone (Calcium carbonate - CaCO3)