A piece of Lignum Vitae is weighed on a small digital scale. (credits to wood-database.com)
Three other factors that can be used to identify wood are its weight, moisture, and hardness.
Compare the weight of your block to that of some known species.
Look for wood information to see standard weights.
Talking about moisture, most fresh wood have higher moisture content.
Dry woods, with <25% relative humidity, tend to have less weight.