The stone on the right is a cabochon cut from rough found in the koroit opal field of queensland australia. Another interesting type of boulder opal is the wood replacement fossil. Iron stone is the yellowish orange material you can see on each other stones. Its water content may range from 3 to 21 by weight but is usually between 6 and 10. The problem and opportunity.
Boulder opal originates in australia with many other opals and is the second rarest type of opal produced. Because of its amorphous character it is classed as a mineraloid unlike crystalline forms of silica which are classed as minerals it is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock being. In some cases the opal is mixed in with the iron stone while other times the opal sits on top. About boulder opal about boulder opal. Boulder opal is minded at a much lower percentage than the percentage of black opal by a 6 variance.
The stone above on the left is a boulder opal bead that displays tiny seams and patches of precious opal. Opal is a hydrated amorphous form of silica sio 2 nh 2 o. Boulder opal is unique in appearance because it is a mixture of opal and host rock generally iron stone. This stone is a naturally occurring matrix that embeds itself in large boulders of ironstone. Boulder opals have more variety and uniqueness compared to other opals and gemstones as so many factors have taking place over million years and different mineralization has helped in huge cross spectrum of unique boulder opals that you can enjoy.
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Boulder opals have more variety and uniqueness compared to other opals and gemstones as so many factors have taking place over million years and different mineralization has helped in huge cross spectrum of unique boulder opals that you can enjoy. The stone above on the left is a boulder opal bead that displays tiny seams and patches of precious opal. Boulder opal originates in australia with many other opals and is the second rarest type of opal produced. The stone on the right is a cabochon cut from rough found in the koroit opal field of queensland australia.
