what are the crystalline shapes of sucrose, sodium thiocyanate, and aluminum pottasium dulfate dodecahydrate??

Answer 1

According to my Handbook of Chemicsty and Physics, 1969 edition:
sucrose: monoclinic
sodium thiocyanate: rhombic
aluminum potassium sulfate dodecahydrate: cubic or monoclinic

See http://en.wikipedia.org/wiki/Monoclinic
for an example of the monoclinic type

Answer 2

http://scripts.iucr.org/cgi-bin/paper?gl0195

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=crystalline+shape+sodium+thiocyanate
(See the top article summarized here.)