Sedimentary Rock (Altered)

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Slate

Slate (Metamorphic Rock)

Quartz Druze (Crystalline Quartz)

Silicon Dioxide (SiO2)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limestone with Calcite Veining

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 based with mineral cement)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Fossiliferous Shale

Laminated Mudrock with plant fossils

Sandstone

Arenite (composed primarily of SiO2)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Gneiss

Gneiss

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Siltstone with flute casts or scratch marks

Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Ferruginous Siltstone or Mudstone

Ferruginous Siltstone / Goethitic Sandstone

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with iron oxide cement)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Gneiss

Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)

Sandstone

Arenite

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Quartz / Common Opal

Silicon Dioxide (SiO2)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Sandstone

Arenite (variable SiO2 composition)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Flagstone (Sandstone)

Clastic Sedimentary Rock (composed of quartz and feldspar)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)