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Spinel is a hard vitreous magnesium aluminum oxide
the Sun Stone
as waters loosen and decompose the organic elements and replace them with silicate substances
the only region in the world where the stone is found
Dendritic Black Opal 8mm Round - 15-16 Inch Color_Gold Spinel is a hard vitreousThis 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.
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