TABULAR VIEW OF THE GENERIC EXTERNAL CHARACTERS OF MINERALS. general generic external characters. 1. Colour. 2. The cohesion of the particles, according to which mine. rals are distinguished into Solid, Friable, Fluid. Particular generic characters of solid minerals. r rt J3 o External shape. External surface. External lustre. Lustre of the frac ture. The fracture. Shape of the frag ments. Particular generic characters ot friable minerals. External shape. The Lustre. Aspect of the particles. Particular generic characters of fluid minerals. The lustre,