What is the density of an emerald?

Question

I need an exact answer, and a source.

Answer 1

Its density is 2.67-2.78. You can not have an exact answer because depending on the source it may have somewhat different components. If you want a single value and not a range you will have to probably specifiy the mine or region.

Source is:
http://hyperphysics.phy-astr.gsu.edu/hbase/minerals/emerald.html

Answer 2

Since emerald is but one of many forms of the beryl gem, it will only have an average density, but I did find a site that lists this, along with other physical properties:
Density: 2.63 - 2.9, Average = 2.76
Empirical formula for beryl: Be3Al2Si6O18
Emerald is the green form of beryl
(makes sense the mineral should be called "beryl" as the first atom is beryllium!)

Answer 3

D=m/v

density is equal to mass divided by volume.