Mineral Description (Anthropogenic Material)

Pyrite

Iron Sulfide (FeS2)

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Tumbled brown quartz/chalcedony (probable)

Quartz, SiO₂; possibly brown chalcedony or jasper

Sandstone (Ferruginous)

Arenite (Fe-rich)

Rough White Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Iron-stained Quartz Vein

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Pink quartz crystal, possibly rose quartz

Quartz (silicon dioxide, SiO₂), likely pink quartz/rose quartz

Polished/tumbled multicolored stone, possibly jasper

Likely opaque microcrystalline quartz (chalcedony/jasper); exact identification is uncertain because the image is out of focus

Chert (Common Opal/Agatized Rock)

Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica

Tumbled blue sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Red jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Rough Diamond

Diamond (Native Carbon), C

Diamond (or Diamond Simulant)

Carbon (C) - Native Element

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Raw Diamond

Diamond (pure Carbon, C)

Pegmatite with quartz, feldspar, mica, and tourmaline

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, muscovite, and black schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Petrified Wood

Silicified wood (Quartz, SiO2)

Granite Pebble

Granite (Plutonic Igneous Rock)

Sandstone

Arenite

Brown chalcedony (likely carnelian/agate)

Cryptocrystalline quartz, SiO₂; iron-bearing chalcedony

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone with Iron Staining

Arenite (SiO2 based with Fe2O3 staining)

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Polished hematite-rich ironstone

Hematite (Fe₂O₃), likely with magnetite and iron-rich jasper/goethite

Pink-and-white quartz-rich rock, likely rose quartz matrix

Quartz (SiO₂), possibly intergrown with feldspar or chalcedony

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Orange Aventurine

Quartz (SiO2) with Hematite or Goethite inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Green Opal (Prase Opal)

SiO2 · nH2O (Hydrated Silicon Dioxide)

Quartz Pebble

Silicon Dioxide (SiO2)

Labradorite (Polished Sphere)

Labradorite ((Ca, Na)(Al, Si)4O8)

Citrine Quartz (Yellow Quartz)

Silicon Dioxide (SiO2) with iron impurities

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)