Man Made Material (Simulated Mineral)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Sandstone (River Cobble)

Sandstone (primarily composed of silica, SiO2)

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Scoria (Volcanic Rock)

Scoria (often basaltic scoria)

Green Jasper

Microcrystalline Quartz (SiO2) with mineral inclusions

Rhodonite

Manganese Silicate (MnSiO₃)

Banded sandstone pebble

Quartz-rich sandstone, likely with a contrasting siltstone or fine-grained sandstone band

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Paleoxylon (SiO2)

Petrified Wood

Siliconized Wood (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Diamond

Native Carbon (C)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Diamond

Carbon (C)

Diamond

C (Native Carbon)

Weathered serpentinite (likely serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite and accessory minerals

Petrified Wood

Silicified Wood (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss

Granite boulder

Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Orange Quartzite / Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Sandstone

Arenite (SiO2 with Fe2O3)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Sandstone

Arenite (primarily Quartz Sandstone)

Sandstone

Arenite (SiO2-rich)

Sandstone

Arenite (primarily SiO2)