I bought this piece sometime in the 1990's. It is drusy quartz on top of chrysocolla on a matrix of black psilomelane (?). These pieces are prized for their vivid color combination. This piece measures 4.2 x 3.5 x 1.5 cm. There are a lot of mines in Chile, but I see very few specimens from the country at shows. Maybe it is time for a trip to Chile!