An introduction to opals


The water content of Opal is not fixed, generally about 3%-10%, but there are as high as 20%; Hardness is 5-5.5; Specific gravity is 1.9-2.5; Generally, egg white, if there are other atoms mixed, can form a variety of colours, such as iron, calcium, magnesium, copper, Opal generally has glass lustre or waxy lustre, if the colour lustre changes with the Angle, it is a precious stone, otherwise just decorative stone. Opals are slowly deposited at low temperatures and can form in almost any rock, though they are usually found in limestone, sandstone and basalt. Opals can also be synthesized, but they are less dense and porous. Australia is the country that produces the most Opal, and Opal is also the "national stone" of Australia. There are three main types of opals. Black O treasure from New South Wales (); Iron ore from Queensland, among which the rarest is the tubular ore from Jiangda District; And white/crystal O Po () from South Australia. If you are looking for high quality, high purity and cost-effective silica, or if you require the latest price of silica, please feel free to email contact mis-asia.

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How opal is formed

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