Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Category
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Jasper with Quartz vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Chert (and Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
Botryoidal Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
Hag Stone
Porous Quartz or Chert Pebble (SiO2)
Red Jasper
Quartz (SiO2) with iron oxide inclusions
Fancy Jasper (Multicolor Agate/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Fairburn Agate
Cryptocrystalline Quartz (SiO2) with trace Iron Oxides
Chert (Flint)
Chert (microcrystalline quartz)
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with iron oxide impurities
Jasper Cross
Silicon Dioxide (SiO2) with iron oxide impurities
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Agate Geode Slice
Silicon Dioxide (SiO2) with trace elements
Hematite
Hematite (Iron(III) oxide, Fe2O3)
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
Turquoise (beads)
Turquoise; CuAl6(PO4)4(OH)8·4H2O
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
Chert
Chert (microcrystalline quartz, SiO2)
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
Chert (Quartz Variety)
Chert (SiO2)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
Blue Calcite
Calcium Carbonate (CaCO3)
Turquoise
Hydrous phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Jasper Chert
Microcrystalline Quartz (SiO2) with iron oxide inclusions
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
Black Onyx or Dyed Agate Node
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Agate (Yellow Moss Agate)
Cryptocrystalline Quartz (SiO2)
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
Banded Agate (Lake Superior Agate style)
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Snakeskin Agate
Cryptocrystalline Quartz (SiO2)
Green Agate
Cryptocrystalline Quartz (SiO2)