Spinel is a legendary gem. In ancient times, high-quality spinel can pretend to be ruby ​​and sapphire. There have been many similar cases in history, and it is known that it is known in modern times. The name of the spinel gemstone is Spinel, derived from the Greek word "Spark", meaning "red or orange natural crystals.
Its composition is mainly magnesium aluminum oxide, with a regular octahedral crystal shape and glass luster belonging to the equiaxed crystal system. Its Mohs hardness is 8, which is smaller than the gemstone of the corundum family, and its refractive index is 1.71-1.73, which is a relatively high refractive index. The main producing areas of spinel are: Myanmar, Sri Lanka, Madagascar, Afghanistan, Pakistan, Brazil, Australia, Sweden, Italy, Turkey, the former Soviet Union, the United States, etc., and there are also a few in China's Henan, Hebei, Fujian, Xinjiang, Yunnan and other provinces. produce.
Like most gems, spinel is based on color, transparency, and weight. Spinel has a variety of colors, of which red spinel is the most popular variety, and the color is bright, the transparency is also high value. There are also a few among the spinels that have a starlight effect. If the color is good, it also has a high value. In addition, spinel can also be artificially synthesized. The commonly used method for distinguishing between spinel and artificial spinel is the observation period inclusion. Synthetic spinels often contain traces of artificial synthesis today, while natural spinels contain naturally occurring inclusions.
Heavy-duty Waterproof Cloth,Tarpaulin Sheets,Tarpaulin Truck,Tarpaulin Canvas,Waterproof Tarpaulin
NINGBO S.DERONS IMPORT AND EXPORT CO.,LTD. , https://www.sderonsyarn.com