Iridium is a member of the platinum group. It is a hard white metal and is used in jewelry to harden platinum. An alloy of 10% iridium and 90% platinum is hard platinum and 5% iridium is medium hard platinum.
IRIDIUM:
A very hard metallic element that occurs naturally in platinum ores. It's exceptionally corrosion-resistant and used principally to harden platinum.
See also: Platinum
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Iridium (Ir)
The alloy, usually about 10% iridium with 90% platinum, is a very hard, white and brittle metal (which is an interesting contrast to Gold which is extremely soft) and is much harder than pure platinum.
Iridium: A metal of the platinum family often alloyed with platinum to improve workability. Pieces marked "80% Plat. 20% Irid" would indicate that the alloy is 80 % platinum and 20% iridium.
Iridium - One of the platinum family of metals. It is often alloyed with platinum to increase workability.
Iridium
Iridium is a metal that is similar to platinum and are commonly alloyed together in order to decrease the cost of a piece of jewelry.
iridium - a hard white metallic element of the platinum group, the most corrosion-resistant and one of the densest elements known. In the massive form it is unaffected by acids, including aqua regia.
Iridium
A metal and member of the platinum family, it is often alloyed with platinum to improve workability, thus you will find pieces marked something like "90% Plat. 10% Irrid" to indicate that the alloy is 90 % platinum and 10% iridium.
Iridium
Platinum
Palladium
Rhodium
Mineraloids Group
A "mineraloid" is a mineral-like substance that does not demonstrate crystallinity and who's chemical composition is beyond the accepted ranges for specific minerals.
Metallic elements which are found in the native state include gold, silver, copper, lead, iron, nickel, platinum, and the rarer elements palladium, iridium, and osmium. Mercury, tantalum, tin, and zinc have also been found.
Jewelry containing at least 50 percent pure platinum and at least 95 percent platinum group metals (platinum, palladium, iridium, osmium, rhodium and ruthenium) is marked with the platinum content followed by the content of the other metal.
Interestingly, Iridium is thought to be more common in extraterrestrial matter than on Earth, ...
Most "platinum" used in jewelry is composed of 90% platinum and 10% iridium, which makes it much harder than pure platinum.
5% ruthenium serves same purpose.
PGM again consists of six related metals including Platinum, Iridium, Palladium, Ruthenium, Rhodium and Osmium. Now all these metals belonging to PGM family have very high melting point.
Small amounts of iridium and ruthenium are commonly added to it, to give it a harder, stronger alloy that retains the advantages of pure platinum.
In the Czochralski method, ingredient powders--nutrients--are melted in a platinum, iridium, graphite, or ceramic crucible.
Six slightly different metals belong to the Platinum Group of Metals (PGM): platinum, iridium, palladium, ruthenium, rhodium and osmium.
(a) It is unfair or deceptive to use the words "platinum," "iridium," "palladium," "ruthenium," "rhodium," and "osmium, ...
Platinum is usually alloyed with Iridium (90% Plat. and 10% Iridium) and more recently Cobalt is being used in Platinum alloys.
Platinum is related to iridium. Platinum is 60% heavier than gold. Iridium and platinum are frequently alloyed together, since the Irridium increases the workability of the platinum. Platinum was only discovered in the 1700's in Russia.
It is frequently alloyed with gold, nickel, iridium, palladium, rhodium, or ruthenium. Platinum jewelry that meets the established standards is marked 900Pt, 950 Plat or Plat.
A soft heavy light gray precious metal usually alloyed with iridium to harden (10% iridium platinum)
Point
In weighing diamonds, 1/100 of a carat, a ten pointer would be .10 carats etc.
Can these miniature diamonds, which are so fine-grained that the researchers deem them the result of a collision, serve as an indicator of this ancient catastrophe, much as the famous iridium layer has done?
Eight metals are considered precious: gold, silver, and the six members of the platinum family - platinum, palladium, rhodium, ruthenium, iridium and osmium.
Platinum Group: The six metallic elements, platinum, palladium, iridium, osmium, rhodium and ruthenium.
Pliers: Two crossed metal limbs, hinged near their extremities, these forming jaws to grasp objects, bend or cut wire.
The Platinum Group Metals (abbreviated PGM) are the precious metals platinum, iridium, palladium, ruthenium, rhodium, and osmium.
Platinum in jewelry is actually an alloyed group of six heavy metals, including platinum, palladium, rhodium, ruthenium, iridium and osmium.
Over the next fifteen years, various chemists discovered palladium, rhodium and iridium, which are part of the platinum group of metals and are frequently utilised in platinum alloys that are used in jewellery.
The majority of our platinum jewellery is 95 percent pure platinum combined with 5 percent iridium, palladium, ruthenium or other alloys. For guaranteed quality in platinum, look for the marks 950 Plat or Plat.
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Strong, lightweight metals such as platinum, iridium, and palladium permitted unconventional settings for gemstones, and new casting methods resulted in more sculptural designs and a greater use of different metallic textures and finishes.
The platinum group metals collectively and in any combination of palladium, platinum, rhodium, ruthenium, osmium, and iridium. Reference to PGM grades for the Company's operations include measured quantities of palladium and platinum only.
More info. on the P G M: Palladium, Rhodium, Ruthenium, Iridium Osmium.
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If a piece of platinum jewelry is marked "iridplat," then it generally contains 90% platinum and 10% iridium, a platinum group metal. If it is marked "plat," then it is at least 95% platinum and another platinum group metal, most likely ruthenium.
In addition, gold is very dense, a cubic meter weighing 19300 kg. By comparison, the density of lead is 11340 kg/m³, and the densest element, Iridium, is 22650 kg/m³.
For more information about Pre-columbian Gold " ...
Platinum: A soft, heavy, light gray precious metal. Alloyed with 5% or 10% iridium it is used in the most expensive jewelry.
These elements are all transition metals, and include ruthenium, rhodium, palladium, osmium, iridium, and platinum. They have similar physical and chemical properties, and tend to occur together in the same mineral deposits.
British manufacturers who followed in the Americans' footsteps included Reliance and Co., who made a highly regarded pen with a 14-carat gold nib, tipped with iridium to improve writing performance.
A noble metal is a metal that will endure as they are resistant to corrosion or oxidation. Gold, platinum, rhodium, palladium, iridium, osmium, and ruthenium metals are generally categorized as noble metals.
Noble Metal ...
While there are accepted purity hallmarks for 850, 900, 950, and 999 parts per 1000, the majority of our platinum jewellery is 95 percent pure platinum combined with 5 percent iridium, palladium, ruthenium or other alloys.
of the metal platinum is grayish white and resembles highly polished silver when finished. It is reasonably malleable and extremely ductile. The metal is softened with small percentages of silver or copper and is hardened when alloyed with iridium.
Chemically, the precious metals are less reactive than most elements, have high luster and high electrical conductivity. Precious metals include gold, silver, the platinum group metals: ruthenium, rhodium palladium, osmium, iridium, and platinum, ...
Besides this Gold is used as a monetary standard. They are also used in art and coinage. Other precious metals include Ruthenium, Palladium, Osmium and Iridium. Rhodium is the most expensive of all the precious metals.
The process is slow and expensive. The highly corrosive nature of the fluxes means that crucibles must be made of a very resistant metal like platinum, iridium or gold, and the process can take months. ...
That name comes from "platina", a Spanish word meaning "little silver", which is what the Spaniards called it when they first encountered it in South America in the 18th century. See also Iridium, Palladium, and Rhodium.
Platinum alloys must consist of 50% pure platinum content (950) and 50% of at least 950 purity platinum group metals (iridium, osmium, palladium, rhodium and ruthenium). Uses of Platinum ...
 See also: Metal, Platinum, Jewel, Jewelry, Alloy
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