Madagascar Dendiritc Green Opal 10mm Round A Grade - 15-16 Inch 6-8x12-25mm ” It is one of

” It is one of the most sought to after minerals among gem and mineral collectors

or some degree of pink in between

Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks

There are 2 specimens pictured to show that there are variations in the size and color

while the Zoisite is light to medium green

Madagascar Dendiritc Green Opal 10mm Round A Grade - 15-16 Inch 6-8x12-25mm ” It is one ofThis 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.