BORON Crystalline Powder. Quantity is 15 grams 98.5% - Industrial grade purity. The element is in the form of a micro crystals. Boron is element No. 5 on the Periodic Table of Elements. There are two allotropes of boron; amorphous boron is a brown powder, but metallic boron (for sale in this listing) is black. The metallic form is hard and a bad conductor in room temperatures. It is never found free in nature. Boron has the highest tensile strength of any known element.(The tensile strength of a material is the maximum amount of tensile stress that can be applied to it before it ceases to be elastic. If more force is applied the material will become plastic or even break. Passed the elastic limit, the material will not relax to its initial shape after the force is removed. The United States and Turkey are the world's largest producers of boron. Boron does not appear in nature in elemental form but is found combined in borax, boric acid, colemanite, kernite, ulexite and borates. Compounds of boron (Arabic Buraq, Persian Burah) have been known of for thousands of years. In early Egypt, mummification depended upon an ore known as natron, which contained borates as well as some other common salts. Borax glazes were used in China from AD 300, and boron compounds were used in glassmaking in ancient Rome.
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