Chert
Chert (Microcrystalline Quartz)
Category
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Chert
Chert (Microcrystalline Quartz)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Pumice
Pumice (Vesicular volcanic glass)
Tumbled turquoise-like stone
Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
Smoky Quartz
Silicon Dioxide (SiO2)
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
Chert
Microcrystalline Quartz (SiO2)
Chert (Flint)
Silicon dioxide (SiO2)
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
Sandstone
Arenite
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
Dyed Quartz Pendant
Silicon Dioxide (SiO2) with artificial dye
Granite
Granite (a plutonic rock)
Granodiorite
Intrusive Igneous Rock
Sandstone (Quartzose)
Arenite (primarily SiO2)
Sandstone
Arenite
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
Vesicular Basalt (or Scoria)
Vesicular Basalt
Gemstone Ring
Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)
Cubic Zirconia and Synthetic Ruby Jewelry
Cubic Zirconia (ZrO2) and Synthetic Corundum (Al2O3)
Faceted blue gemstone, likely blue topaz or synthetic spinel
Topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); image insufficient for certainty
Sandstone
Arenite (primarily SiO2)
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Greenstone
Metabasalt / Metavolcanic rock
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
Sandstone
Arenite (composed primarily of SiO2)
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
Lapis Lazuli
Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Slate
Metamorphic Pelitic Rock
Slate
Metamorphic Pelitic Rock
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)