Is a Lead Copper Vanadinate Hydroxide with formula
PbCu(VO4)(OH) , hardness is 3-3.5
This mineral is rarely found pure, is alway mixed with Descloizite a similar member of the same group in wich instead of copper we have zinc.
A quite rare gem material, always translucent and often found is small crust or stalactites. This gem comes from Ojuela Mine,Mapimi,Durango,Mexico.