Metallurgical assay and the U.S. Mint continue to produce precious metal bullion coins for collectors and investors. The precious metal purity and content of these coins is guaranteed by the respective mint or government, and, therefore, the assay of the raw materials and finished coins is an important quality control. In the UK, the Trial of the Pyx is a ceremonial procedure for ensuring that newly minted coins conform to required standards. Metallurgical assay A metallurgical assay is a compositional analysis of an ore, metal, or alloy. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Coins of the Cypriot pound 3. Coins were introduced for ½, 1, 2, 5, 10 and 20 cents, with the ½ cent the same size and composition as the earlier 5 mil coins. The other coins were struck in nickel-brass. The ½ cent was only struck in 1983. In 1991, cupronickel, seven-sided (reuleaux heptagon) 50 cent coins were introduced. The 20 cent coin currently minted has a different reverse side than the one shown above. Specifically, it shows the head of Cypriot philosopher Zeno of Citium. When brand new, the first five coins (1, 2, 5, 10, and 20 cent) have exactly the same bright