The idea is that this material would be more viable than rare as it is slightly heavier than the normal materials but is flat out more efficent in terms of strength.
Heavier usually means more mass. Unless the gravitational pull varies, or one sample is larger than the other.
Let's assume for a second that the comparison between "rare" metals and "bithium" metals were of the same volume, as it has to be to make a comparison about mass (I'll say a half liter, 500ml each).
Now if the sample of bithium was "slightly heavier" (I'll assume that rare, R = 1.5kg, and that bithium, B = 2kg) than the sample of bithium (using the Density= Mass/Volume) is:
R=1.5kg=1500g
D=1500g/500ml= 3 g/ml
B=2kg=2000g
D=2000g/500ml=4g/ml
OH LOOK, THE BITHIUM IS DENSER!
And explain to me two things:
1.) What exactly is a average rare ore composite?
2.) What metals are contained in Bithium ore? Rare and common ores contain many different types of metals, inculding the densest naturally occuring (in more than miniscule amounts) metal, uranium. Also please specify the Atomic mass, names and such of the materials contained in the bithium ores.