Flint (or Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Man Made Object (Coin)
Browse man made object (coin) specimens identified by the Rock Identifier community.
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Quartzite (River Pebble)
Quartzite (Mainly SiO2)
metamorphic
Larimar
Pectolite (a variety of pectolite, NaCa2Si3O8(OH))
Mineral
Tiger's Eye
Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)
Mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Gold
Native Gold (Au)
mineral
Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Dolerite (Diabase)
Dolerite / Diabase
igneous
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Carnelian
SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony
mineral
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Howlite (Tumbled)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Jasper (specifically Fancy or Polychrome Jasper)
Silicon Dioxide (SiO2) - Chalcedony
Sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Jasper (Red Jasper)
Jasper (SiO2 - Silicon Dioxide with iron inclusions)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Black Onyx
Black Chalcedony (SiO2)
mineral
Malachite
Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Malachite
Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2
Mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)