It could maybe be Canarywood like Markus (SabertoothBunny) suggested as well. Canarywood has been said to have a distinct, sweet, fruity odor when being worked.
Maybe you can do a fingernail test? Tulipwood is very hard compared with Canarywood (almost double on the Janka Scale) so if you can make a dent in it it would likely be Canarywood. I think it would be hard to determine the difference based on weight though. Tulipwood is just a little heavier at about 60 lbs per cubic foot where Canarywood is only about 50 lbs. If you have a black light you might see if it has faint to medium yellow streaks which would indicate Canarywood. Tulipwood generally does not glow under a black light. Tulipwood usually also has a finer, more uniform grain where Canarywood usually has a more pronounced grain pattern with visible streaks. (Canarywood is also generally more readily available than Brazilian Tulipwood - as someone already noted, Tulipwood is listed in CITES because it is a true rosewood but Canarywood is not).
If all else fails, Heads = Canarywood / Tails = Tulipwood.
Dave