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Lower ranks of coal can be less expensive, for example sub-bituminous coal can cost around US$0.038/kg carbon. [19] Graphite flakes can cost around US$0.9/kg carbon. [ 20 ] Price of synthetic industrial diamond for grinding and polishing can range from 1200 to 13 300 USD/kg, while cost per weight of large synthetic diamonds for industrial ...
Jeremejevite is an aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is Al 6 B 5 O 15 (F,OH) 3. It is considered as one of the rarest, thus one of the most expensive stones. For nearly a century, it was considered as one of the rarest gemstones in the world. [5] [better source needed]
Used nuclear fuel is therefore a potential source of rhodium, but the extraction is complex and expensive, and the presence of rhodium radioisotopes requires a period of cooling storage for multiple half-lives of the longest-lived isotope (101 Rh with a half-life of 3.3 years, and 102m Rh with a half-life of 2.9 years), or about 10 years. These ...
Although aluminium is the third most abundant element and the most abundant metal in the Earth's crust, it was at first found to be exceedingly difficult to extract the metal from its various non-metallic ores. The great expense of refining the metal made the small available quantity of pure aluminium more valuable than gold. [16]
This mineral is rare because it contains a large number of rare elements. [19] This mineral can be classified as semi-soluble salt due to its limited solubility in water and capacity to form ionic bonds. [19] Bastnäsite deposits are found in China and the USA. [19] Bastnäsite is a mineral that originates from Madagascar.
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Pure lutetium metal is very difficult to prepare. It is one of the rarest and most expensive of the rare earth metals with the price about US$10,000 per kilogram, or about one-fourth that of gold. [41] [42] Crushed minerals are treated with hot concentrated sulfuric acid to produce water-soluble sulfates of rare earths.
Ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. [3]