Metamorphic Or Sedimentary (With Staining)

Quartzite

Quartzite (primarily SiO2)

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Yellow Jasper (Limonite-stained Chert)

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (with Desert Varnish/Iron Stain)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Quartz (Milky/Cloudy Variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Petrified Wood (Silicified Wood)

Silicified fossil wood (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Rhodonite

Manganese Inosilicate (MnSiO3)

Dragon Blood Jasper

Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Pyrite

Pyrite (FeS₂)

Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)

Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.

Quartzite

Quartzite (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Pyrite

Iron Sulfide (FeS2)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Quartz River Pebbles

Silicon Dioxide (SiO2)

Banded Agate (with possible Chalcedony layers)

Silicon dioxide (SiO2)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)