Is a Manganese Calcium silicate with formula (Ca,Mn)SiO3 and hardness 5.5-6-6
Often associated with sugilite and richterite but always opaque and full of fractures. Is very rare to find it translucent or gem quality without impurity, maybe less then 1/1000 is of good quality.
This material comes from Wessel Mine, Kalahari Manganese Fields,South Africa.
Size: 7x7x5 mm.