Mineral On Sedimentary Rock

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Specular Hematite

Specularite (Fe2O3)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Mudstone variant)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Chert

Silicon dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Wonderstone (Banded Rhyolite)

Rhyolite (Silicon Dioxide with Iron Oxide impurities)

Gneiss Pebble

Gneiss