Organic Materia (Not A Rock Or Mineral)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Glauconitic Sandstone

Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Jasper

Silicon dioxide (SiO2)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Pyrite on Limestone

Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix

Moss Agate / Chalcedony

Silicon Dioxide (SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Agate (Moss or Dendritic Agate)

Chalcedony (Silicon Dioxide, SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Fossiliferous Shale

Laminated Mudrock with plant fossils

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Jasper

Silicon dioxide (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Tree Agate (or Moss Agate)

Dendritic Agate (Silicon Dioxide - SiO2)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Petrified Wood

Silicified Wood (SiO2)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)