Limonite/Goethite Nodule
Iron Oxyhydroxide (primarily FeO(OH)·nH2O)
mineral
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Chert (Chert / Flint nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert / Microcrystalline Quartz
Chert (SiO2)
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Dyed Agate
SiO2
Mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Mineral
Chert (Red/Pink variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Nodular Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (specifically Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert with Iron Staining
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper/River Rock)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Black Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Chert (containing small fossils)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Fairburn Agate / Agate-bearing Breccia
Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix
sedimentary
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide (SiO2) with inclusions
mineral
Chrysocolla on Quartz with Iron Oxides
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Chalcedony (Quartz Var.)
Silicon Dioxide (SiO2)
mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral