A variety of opal from the highlands of Peru's Andes. Unlike typical opal, it shows no play of colour—an opaque, pale pink covers the entire surface.

The pink comes from palygorskite, a silicate mineral, incorporated as volcanic silica filled voids in sedimentary rock. Opal without play of colour is classified as "common opal," but in this case, the absence of spectral play is replaced by the quietness of the colour itself.

Also Peru's national stone. In the dry Andean air, this pink seems to carry further than it should.