Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Category
Mineral, Organic Gemstone
Browse mineral, organic gemstone specimens identified by the Rock Identifier community.
Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)
mineral
Amber
Succinite (fossilized tree resin)
mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Amber
Succinite (C10H16O)
Mineraloid
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Amber
Succinite
Organic Mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
Mineral
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Amber
Succinite
mineraloid
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary