Crystallographic Planes Miller Indices: Reciprocals of the (three) axial intercepts for a plane, cleared of fractions & common multiples. All parallel planes have same Miller indices Algorithm 1. If plane passes thru origin, translate 2. Read off intercepts of plane with axes in terms of a, b, c 3. Take reciprocals of intercepts 4. Reduce to smallest integer values 5. Enclose in parentheses, no commas i.e., (hk)