2. The important direction in cubic crystals <100>: crystal axes <110>: face diagonal <111>: body diagonal <112>: apices to opposite face-centers 3. Family of directions consists of crystallographically equivalent directions, denoted <uvw> e9.<100>[1001+[010]+[001+ [100]+[010]+[001]2. The important direction in cubic crystals: <100> : crystal axes <110> : face diagonal <111> : body diagonal <112> : apices to opposite face-centers 3. Family of directions consists of crystallographically equivalent directions, denoted <u v w> e.g. [100] [010] [001] 100 [100] [010] [001] + +  = + + +