Red Sandstone Pebble
Sedimentary quartz sandstone
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
View all →
Granite
Granite (High-silica plutonic rock)
igneous
Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)
mineral
Citrine Quartz Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite
Granite
Igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Pumice
Pumice
igneous
Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate / Chalcedony
mineral
Ferruginous Slag (Iron Smelting Byproduct)
Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)
Mineraloid/Anthropogenic (Technofossil)
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Limonite
FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)
mineral
Chrysocolla-rich copper ore
Chrysocolla, a hydrated copper aluminosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with malachite or turquoise-group minerals
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper aluminum phosphate)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Selenite (gypsum)
Gypsum, CaSO₄·2H₂O; variety commonly called satin spar or selenite
mineral
Polished blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Ruby (Corundum)
Aluminum Oxide (Al2O3) with Chromium traces
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Tiger's Eye (often misinterpreted as Gold Ore in this context)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Pumice
Pumicite (Volcanic glass with vesicular texture)
igneous
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ironstone Nodule
Ferruginous Sandstone / Limonite Concretion
sedimentary
Green aventurine cabochon (likely)
Quartzite/aventurine quartz, predominantly SiO₂ with possible fuchsite mica
gemstone
Tumbled yellow jasper or serpentine
Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄
mineral
Dyed or treated turquoise-like tumbled stone
Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Mahogany Obsidian
Natural Volcanic Glass (SiO2 with iron and magnesium oxides)
igneous
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian with Perlitic Crust
Volcanic Glass (SiO2)
igneous