Industrial Byproduct (Anthropogenic Rock Like Material)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Tumbled labradorite

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Garnet-Bearing Gneiss

Garnetiferous Feldspathic Gneiss

Sandstone

Arenite (SiO2 based)

Quartz with Iron Oxide

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Red)

Arenite (primarily SiO2 with Fe2O3)

Beryl (Emerald variety in host rock)

Be3Al2(SiO3)6 (Silicate mineral)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

Sandstone

Arenite (primarily Quartz Arenite)

Quartz (Float/Abraded)

Quartz (SiO₂)

Chert / Chalcedony Nodules

Silicon Dioxide (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Red Sandstone

Arenite (Ferruginous Sandstone)

Chert / Jasper

Silicon Dioxide (SiO2)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite

Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)

Red Sandstone Pebble

Arenite (Iron-oxide stained)

Greenschist (or Serpentinite with Manganese Dendrites)

Greenschist facies metamorphic rock

Shale

Fissile Mudstone

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone / Fossil Fragment

Calcium Carbonate (CaCO3) with indeterminate biogenic remains

Quartz Vein in Schist / Gneiss

Silicon Dioxide (SiO2) in Metamorphic Matrix

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Sandstone (SiO2 dominated)

Small metallic meteorite-like specimen

Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag

Chert (Flint)

Silicon dioxide (SiO2)

Basalt

Basalt (containing Pyroxene and Plagioclase Feldspar)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 predominant)

Agate (Common Chalcedony)

Silicon Dioxide (SiO2)

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Granite Pebble

Granite (High-silica plutonic rock)

Basalt with Iron Oxide staining

Basalt (Mafic volcanic rock)

Quartzite

Quartzite (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified Wood (SiO2)