Man Made Material (Constructed)

Gneiss (Banded Gneiss)

Gneiss

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Chert

Chert (SiO2)

Biotite on Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Polychrome Jasper (Desert Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Quartzite

Quartzite (SiO2)

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Greenschist

Greenschist (Actinolite-Chlorite Schist)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Sandstone

Arenite (primarily SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Jasper

Silicon dioxide (SiO2)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Sandstone

Arenite (often composed of Quartz, SiO2)

Granite Pebble

Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Dacite

Dacite (Intermediate volcanic rock)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Amethyst

Amethyst (Silica mineral, SiO2)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Limestone

Calcium Carbonate (CaCO3)

Coquina

Biogenic Limestone (Calcite/Aragonite)

Sandstone (Ferruginous)

Arenite (Fe2O3 staining)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Granite

Phaneritic Plutonic Igneous Rock

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Quartzite Pebbler

Quartzite (SiO2)

Sandstone

Arenite/Quartz Arenite

Quartzite Pebble

Quartzite (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Devil's Toenail

Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)

Decomposed Granite

Grano-diorite/Granite-residuum (SiO2 primary)

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)