A rare Lead Sulfate mineral with formula:PbSO4. Hardness is 2.5-3
Very high specific gravity and exceptional luster when cut and polished properly like in this case by Luigi Mariani; altough is a soft stone the high content in lead gives to this gem an high dispersion.
Definetly a collector stone not often found for sale.Flawless. From Morocco.
Weight: 5.55 ct.