Opal is gem,or rotten of some combination?
回答 (3)
2015-12-26 3:31 pm
An Opal was also a brand of car.
2015-12-26 11:18 pm
It is a mineral with a chemical composition of SiO2 H2O. It is an expensive gem if it has a strong play of color. Much opal does not have any play of color and is called potch.
2015-12-26 3:36 pm
gem
收錄日期: 2021-04-21 16:01:42
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