The mining area is near Ica, 250 km SE of Lima, close to the abandoned Monterrosa copper mine. Pink Opal
forms veins up to 30 cm thick. The new material has a zoning - the oldest generation is Pink opal
containing lustrous cavities covered by tiny quartz crystals, a younger part of vein is Milk opal
, and the youngest generation is colourless hyalite opal. Soft white veinlets of pure palygorskite
occur in some specimens.
Massive snow white opal
is common at Monte Rosa, it is very popular for beads, as it resembles pearl
Ref: J.Hyrsl (2012) Gemstones of Peru, pp. 57, 62