TOPAZ


9/25/03


Topaz is a very interesting mineral with all of its characteristics and features. The chemical formula for topaz is Al 2 SiO 4 (F, OH) 3 which stands for Aluminum Silicate Fluoride Hydroxide. Topaz is in the class of Silicates, and subclass of Nesosilicates. Some uses for Topaz is its gemstone worth, and optical properties in industries. The crystal pattern is hexagonal. The color is clear, yellow, orange, red, blue and green. The hardness is 8, specific gravity is 3.4-3.5, which is above average, and the streak is white. It has straight cleavage in one direction. Some common locations of it are Minas Gerias, Brazil; Pakistan; San Diego, California; Ural Mountains, Russia; Mexico, and the Thomas Range, Utah. It is found commonly with quartz, tourmalines, micas, brookite, cassiterite, and fluorite. Topaz crystals can reach incredible size of several houndred pounds. Topaz, which is the birthstone of November got its name from the name of an island in the Red Sea, formerly called Topazos, now Zebirget.Topaz can make a very attractive mineral due to its high luster, nice colors and well formed and multifaceted crystals.


I got my information from http://www.birthstones.com/stone_nov.html, and http://mineral.galleries.com/minerals/silicate/topaz/topaz.htm