fibrous brown blende. 433 It occurs massive and reniform. It is glistening, passing into strongly glimmering, and is resinous. The fracture is extremely delicate scopiform and stel lular fibrous. ... It occurs in large and coarse granular distinct concre tions, which are intersected by curved lamellar concre tions, bent in the direction of the external surface. It is opaque, or very feebly translucent on the edges. In other characters, it agrees with foliated brown blende. Constituent Parts. so From the Breisgau. Zinc, - - - - 62 Iron, .-- - 3 Lead, 5 Arsenic, - - - I Sulphur, - ^ Alumina, . - - 2 Water, - ^ 98 Ilecht, in Journ. d. Min. t. xlix. N. 13. Geognostic and Geographic Situations. It occurs, along with galena or lead-glance and iron- Pyrites, at Geroldseck in the Dreisgau •, and Kaibel in Carinthia. Vol. Iir. Third