I've had MDMA which is anything from white to brown (and heard of MDMA anything from pink to black), so I guess the stuff I've had could probably pass for grey. Chemicals come in a range of colours, and to my knowledge the aniseed smell from MDMA is caused by leftover chemicals from the manufacturing process.
It's not really abnormal for you to have MDMA such as you do, and nobody can tell whether it is/isn't MDMA. If you want to know for certain then buy a test kit, or send it off for laboratory analysis at: