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Mohs hardness 7
It is a phyllosilicate composed of silicon
periwinkle
but can be distinguished by its structure and its lower relative hardness
Black Opal Australian, Faceted 4mm Round - 15-16 Inch Green Brecciated Jasper Mohs hardness 7Black Opal is a naturally occurring variety of precious opal mined in Australia. this opal variety is characterized by their dark base tone. It is mined under extremely harsh conditions and the high grade specimens are more rare than diamonds. Australian Aboriginal tribes referred to Black Opal as "Fire of the Desert."
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