Mexican jadeite-bearing rock: a first mineralogical and gemmological approach

摘要

Jadeite-bearing pebbles have been found in secondary deposits overlying Cretaceous sediments in the Vizcaino Peninsula, Sierra San Andres, Baja California Sur, Mexico, the first in the country. These pebbles are probably derived from a blueschist assemblage associated with a serpentinite-matrix melange complex about 2 km north of Puerto Nuevo. Jadeite is accompanied by omphacite and aegirine, and different associated minerals enable distinction from Californian and Guatemalan jadeites.