1 What is mineral? "Every distinct chemical compound occurring in inorganic nature,having a definite molecular structure or system of crystallization and well-defined physical properties,constitutes a mineral species"(Brush Penfield,1898).1 What is mineral?  "Every distinct chemical compound occurring in inorganic nature, having a definite molecular structure or system of crystallization and well-defined physical properties, constitutes a mineral species" (Brush & Penfield, 1898)