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Historically
this wood variety is so hard that it is often used in heavy construction for beams
However in some regions
This prompted an alternative name for the gemstone: Princess Blue
Dendritic Black Opal 8mm Round - 15-16 Inch Sage HistoricallyThis variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones.
