Chert (Green variety)
Microcrystalline Opaline/Quartz (SiO2)
sedimentary
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Red Jasper
Jasper (Silica with Iron Oxide inclusions), SiO2
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Fancy Jasper (Multicolor Agate/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Quartz Geode in Chert/Limestone Matrix
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
sedimentary
Orange Aventurine (Sunstone-style Quartzite)
Silicon Dioxide (SiO2) with Goethite or Hematite inclusions
metamorphic
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Green Quartzite
Quartzite (primarily SiO2 with trace impurities)
metamorphic
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Zebra Jasper (Zebra Stone)
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary