Madagascar Green Dendritic Opal 6mm Round - 15-16 Inch R1180 The most common members of

The most common members of the feldspar group are the plagioclase feldspars and the alkali feldspars

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limestone and copper

It is frequently fluorescent under ultraviolet light

Terahertz is a spectacular man made ore

Madagascar Green Dendritic Opal 6mm Round - 15-16 Inch R1180 The most common members 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.