Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins The most common members of

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

forming Tektite

The proper name for Rosewood is Petersianthus quadrialatus

Kyanite is also extremely useful in industrial applications due to its high heat resistance

” referring to the patterns in the stone looking like broken

Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins 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.