Sedimentary (Biogenic Sediment Or Biological Remain)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxide impurities

Jasper

Silicon dioxide (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Chert (Flint / Chalcedony variety)

Microcrystalline Quartz (SiO2)

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Red Jasper

Jasper (variety of Chert/Chalcedony, formula SiO2)

Sandstone

Arenite (mostly Quartz-based)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Bumblebee Jasper

Calcite with Arsenic and Manganese oxides (technically a volcanic rock)

Red Sandstone Pebble

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)

Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Fossilized Gastropod in Limestone

Gastropoda (Class) in Fossiliferous Limestone

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Iron-stained chert or siliceous pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

Weathered iron-rich sandstone or laterite

Ferruginous sandstone; potentially lateritic ironstone, composed mainly of quartz (SiO₂) with iron oxides/hydroxides

Rounded sandstone pebble

Quartz-rich sandstone (likely arkosic or lithic sandstone)

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)

Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Greenstone / Graywacke

Lithic Sandstone (Graywacke)

Echinoid Fossil (Sea Urchin Fossil)

Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone with Brachiopod Mold Fossil

Sedimentary rock (Sandstone) with indeterminate Brachiopod mold

Iron-stained limestone or coral fragment

Calcite-rich carbonate rock; chiefly CaCO₃ (exact identification is uncertain from the image)

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper

Likely tumbled jasper or chert specimens

Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph

Orbicular jasper (orbicular chert), likely ocean jasper

Silicified microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and/or clay-rich orbicules

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Chert (flint-like chalcedony)

Microcrystalline quartz, SiO₂

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), commonly with chalcedony and minor iron oxides

Iron-rich laterite or weathered ironstone

Ferricrete/limonite-rich ironstone; primarily goethite (FeO(OH)) and hematite (Fe₂O₃), with clay minerals

Graywacke Pebble (River Stone)

Graywacke (Lithic wacke)

Jasper

Silicon Dioxide (SiO2)

Polychrome Jasper (Desert Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Petrified Wood

Silicified Wood (SiO2)