Belong to the Feldspars group with formula Na(90-70%) Ca(10-30%) (Al, Si)AlSi2 O8, a Sodium Calcium Aluminum silicate. Hardness is 6-6.5.
The flashes of red color are caused by hematite platelets inclusions.
This material comes from Arusha region, Tanzania; compared with Indian stones, shows bigger hematite crystals and generally is more transparent with a slights green tone.
Size: 9x7.3x4.6 mm.
Weight: 1.94 ct.