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Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks
with mirrored or coordinating patterns that bring strong color
They are all silicate minerals
Howlite can be easily dyed and is often treated to be blue for use as a substitute for turquoise
the other being Diamond
Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch BirdsEye Biotite is a name usedThis 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.
