Pegmatitic cordierite from the Owl Mts (Sudetes)

Abstract

The first reported cordierite from pegmatitic formations of the Sudetes Mts reveals a high concentration of FeO and small amount of BeO. Both crystallochemical formula and unit cell parameters of this cordierite were calculated. The distortion index Δ = 0.18 suggests that the investigated cordierite presents an intermediate form between the high and low variety. Studies of fluid inclusions reveal its crystallization under the conditions characterized by pressure about 2 kbars, and temperatures at the range of 700-750oC.