Jadeite: shock-induced formation from oligoclase, ries crater, Germany.
Jadeite (high-pressure sodium aluminum pyroxene) has been identified in a shock-phase assemblage of oligoclase. The shock assemblage consists of minute particles with high refractive indices that contain at least two phases: one (identified by x-ray) is a jadeite that is nearly pure NaAlSi(2)O(6); the other has the chemical composition of oligoclase minus jadeite and appears to be largely amorphous.
James
O B
OB