191Ir and 193Ir are the only two naturally occurring isotopes of iridium, as well as the only stable isotopes the latter is the more abundant. Iridium is one of the rarest elements in Earth's crust, with annual production and consumption of only 3 tonnes (6.6 thousand pounds). Smithson Tennant, the primary discoverer, named it after the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. ![]() Iridium was discovered in 1803 among insoluble impurities in natural platinum. However, corrosion-resistance is not quantifiable in absolute terms although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable, whereas gold dust is not flammable but can be attacked by substances that iridium resists, such as aqua regia. It is one of the most corrosion-resistant metals, even at temperatures as high as 2,000 ☌ (3,630 ☏). ![]() A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm3 (0.815 lb/cu in) as defined by experimental X-ray crystallography. Iridium is a chemical element with the symbol Ir and atomic number 77. Please ensure that you arrange appropriate insurance cover where possible.Wikipedia Rate this definition: 0.0 / 0 votes Please note, Arnold Clark Autoparts accepts no responsibility for the loss or damage of goods during transit. Otherwise, you will need to meet the cost of postage, unless otherwise agreed by Arnold Clark Autoparts. We will refund any postage charges where the return has been due to an error on our part. Please note that our branches are not able to issue a refund or exchange for goods that you received by post. Please still print off and complete the returns form before bringing it, and your unwanted goods, into the branch. If you return items to an Arnold Clark Autoparts branch, we can send them back to the Arnold Clark Autoparts E-commerce Team free of charge. All refunds will be made via your original payment method. We aim to process all refunds within 48 hours of receiving returned items, as long as they are undamaged and in a saleable condition. Do make sure you include this in your package. ![]() We can process refunds far more quickly and efficiently if we also receive a completed returns form. We can only issue a refund after the goods have been returned to us. ![]() Please print out the returns form, fill it in and send it back with any returned items. Please inform Arnold Clark Autoparts of any returns request within seven working days of delivery. In the event that you receive a faulty or incorrect item from Arnold Clark Autoparts, please let us know as soon as you can so that we can arrange a replacement. However, it must be returned in a resalable condition, with its original packaging included. If you change your mind about an item you’ve purchased from us or you’re not satisfied with it, you can return it. To make a return, just print off our returns form, fill it in, and pop it in with the items. We hope you’re satisfied with your purchase from Arnold Clark Autoparts, but we do understand that sometimes you might need to make an exchange or return.
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