Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material) in the encyclopedia
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Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Amber (Raw)
Succinite (Fossilized Resin)
mineraloid
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
African Turquoise (Jasper)
Quartz (SiO2) with impurities (Epidote/Amphibole)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Garnet
Almandine/Pyrope Garnet (X3Y2(SiO4)3)
mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Jade Ring
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Tumbled Rose Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (Permineralized wood)
fossil
Rose Quartz (or Quartzite)
Silicon Dioxide (SiO2)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Moonstone
Orthoclase (KAlSi3O8), specifically the variety showing adularescence
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pearl (Cultured Freshwater)
Calcium Carbonate (Aragonite) - CaCO3
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Blue Zircon
Zircon (Zirconium Silicate, ZrSiO4)
gemstone
Sandstone
Arenite
sedimentary
Amber and Citrine Quartz
Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)
mineral
Petrified Wood
Silicified Paleoxylon (SiO2)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with chromium trace elements)
gemstone
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Pearl
Aragonite and Calcite (CaCO3) with Conchiolin
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic