Sedimentary (Silicified Fossiliferous Chalcedony)

Petrified wood

Silicified wood, commonly quartz (SiO₂) replacing woody tissue

Polished Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

Sandstone Concretion with Fossil Wood

Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Weathered jasper or iron-stained quartzite

Silicified quartz-rich rock, primarily microcrystalline quartz (SiO₂) with iron-oxide/hydroxide staining

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Polished ocean jasper / orbicular jasper

Silicified rhyolite or chalcedony-rich microcrystalline quartz (SiO₂), commonly sold as ocean jasper

Fossiliferous Limestone

Calcareous Sedimentary Rock (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Fossiliferous limestone

Calcite-rich limestone (CaCO₃), possibly coral or shell-bearing

Fossiliferous Limestone

Calcite (CaCO3) matrix with biogenic fragments

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3)

Fossiliferous Limestone

Sedimentary Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcite, CaCO3)

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Fossiliferous Carbonate Rock (CaCO3)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclasts

Polished petrified wood

Silicified wood; commonly quartz/chalcedony (SiO₂) replacing cellular tissue

Yellow chalcedony (likely polished/tumbled pieces)

Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture

Petrified Wood (Silicified Wood)

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Fossiliferous Limestone

Biogenic Limestone containing marine invertebrate fossils

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Tumbled fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with fossil shell fragments

Mother of Pearl (Nacre) / Shell Fragment

Biogenic Calcium Carbonate (Aragonite and Conchiolin)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Fossils

Fossiliferous Limestone

Calcium carbonate (CaCO3) with marine fossils

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Glauconitic Sandstone (Greensand)

Glauconitic quartz wacke or arenite

Fossiliferous Limestone

Bioclastic Limestone

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3 with fossil fragments)

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)

Fossiliferous Limestone

Fossiliferous Limestone (containing bioclasts)

Fossiliferous limestone

Calcitic limestone; predominantly calcium carbonate (CaCO₃), commonly as calcite with fossil fragments

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

Unidentified tumbled translucent stone

Possibly quartz/chalcedony; exact identification requires hardness and diagnostic testing

Fossiliferous limestone

Calcitic limestone, predominantly CaCO₃ (calcite), with possible shell or coral fossils

Fossiliferous Limestone

Calcite-rich sedimentary rock with invertebrate fossils (CaCO3)

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)