Green Sandstone (Glauconitic Sandstone)
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Category
Biogenic Material
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Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Chert (Chalcedony/Common Opal)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Agate
Silicon dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Jasper (Nephrite-like appearance)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
River Stone (Greywacke)
Greywacke (immature sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sandstone (Arenite)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone
Sedimentary quartz arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Microcline Feldspar
KAlSi3O8
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary