Constraint on the formation conditions of the jadeite veins from a viewpoint of the coexistence of celsian-cymrite

Abstract

Coexistent txture of celsian and cymrite at equilibrium is found in some veinlets running across jadeitites or their associated rocks from the Wakasa district, Tottori Prefecture. The veinlets are mainly composed of the prismatic jadeite crystals. Pale-yellow coloured spots are occasionally observed in the veinlets, which are composed of the intergrown aggregates of itoigawaite-pumpellyite. Celsian and cymrite are distributed along the boundary of the pale-yellow spots. We can constrain the formation conditions of the jadeite veinlets on the basis of the coexistence of celsian and cymrite and the presence of pumpellyite.