Natural Spessartite Garnet, in the trade also called "mandarin garnet". Pure and vibrant transparant intense orange colour. Cut as an cabouchon oval but has the ability to be faceted to a wonderfull gemstone cut. Measurements are L 11.76 x W 9.96 x D 5.97 mm Spessartite Garnet; Origin and Sources Spessartite garnet deposits are found in Burma (Myanmar), Brazil, China, Kenya, Madagascar, Sri Lanka (Ceylon), Tanzania and the USA. The most desirable gemstones come from Namibia and are known as "mandarin spessartite". Spessartite Garnet Gemological Properties Characteristics Values Chemical Formula: Mn3Al2(SiO4)3 Manganese aluminum silicate Crystal Structure: Cubic; rhombic dodecahedron, icositetrahedron Color: Orange, orangey-yellow, red-brown Hardness: 6.5 to 7.5 on the Mohs scale Refractive Index: 1.790 to 1.820 Density: 4.12 to 4.18 Cleavage: Indistinct Transparency: Transparent, translucent Double Refraction or Birefringence: Usually none Luster: Vitreous Fluorescence: Mainly none