Is a Calcium aluminum silicate with formula CaAl2 Si2 O8
and hardness of 6-6.5
One of the rarer member of the plagioclase series and uncommon to find either in facet or cabochon.
It shows a strong red fluorescent in UV short wave,while in the long wave almost inert.
It comes from the Monzoni Mountains, Va di Fassa,Italy. Translucent to opaque.Untreated.