Starting on 12/15/14, my buddy and I began compiling data regarding what The Cryptarch decodes Blue/Purple engrams into. Below are our results: 519 Blue/Rare Engrams turned into: 426 Blue/Rare Weapons/Armor (82.1%) 61 Motes of Light (11.7%) 26 Strange Coins (5.0%) 6 Purple/Legendary Items (1.2%) 28 Purple/Legendary Engrams turned into: 18 Purple/Legendary Items (64.3%) 9 (2) Ascendant Shards (32.1%) 1 Exotic Item (3.5%) Hope this helps!