Sedimentary Rock (Possibly Composed Of Various Minerals)

Ironstone

Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Turquoise

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

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Clastic Sedimentary Rock

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Quartz

Quartz (SiO₂)

Sandstone (Ferruginous)

Arenite with Iron Oxide staining (Fe2O3)

River Stone (composed of Siltstone/Basalt mixture)

Siltstone or microcrystalline Basalt pebble

Quartz

Silicon Dioxide (SiO2)

Quartz pebble in a coarse mineral-rich rock

Quartz (SiO₂), possibly in a quartz-rich conglomerate or breccia

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (high iron oxide content)

Fine-grained gray-green rock, likely basaltic or volcanic stone

Probable basalt or microcrystalline mafic igneous rock; exact identification requires a fresh surface and testing

Chalcedony (possibly lavender or gray agate)

Microcrystalline quartz, SiO₂; fibrous quartz aggregate

Sandstone

Clastic Sedimentary Rock

Conglomerate

Conglomerate (a clastic sedimentary rock)

Purple Chalcedony

Silicon Dioxide (SiO2)

Dalmation Jasper

Dalmation Stone (perthitic feldspar with arfvedsonite)

Likely mica-rich schist (possibly phyllite)

Muscovite–biotite schist; exact identification requires examination of a fresh surface

Banded gneiss

Gneiss, composed mainly of quartz, feldspar, and mica

Sandstone

Clastic Sedimentary Rock

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Quartz with Inclusions

Silicon Dioxide (SiO2)

Likely weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

Iron-rich weathered rock, possibly ironstone

Ironstone (composition uncertain; likely iron oxides such as goethite and limonite)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Weathered iron-rich rock, possibly ironstone

Likely ferruginous sandstone or ironstone; exact identification is uncertain from the photo

Marble

Recrystallized Carbonate Rock (CaCO3)

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Quartz

Silicon Dioxide (SiO2)

Apatite

Fluorapatite (Ca5(PO4)3F)

Sandstone

Clastic Sedimentary Rock

Sandstone

Clastic Sedimentary Rock

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Ironstone concretion (possibly a pyrite-bearing concretion)

Iron-oxide-cemented sedimentary concretion; exact mineral composition cannot be confirmed from the photograph

Quartz and Mixed Minerals

Silicon Dioxide (SiO2)

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)