I am attempting to write a series of articles for our website (we sell semi-precious beads) but I am a little puzzled by finding differing values on various sites for characteristics that I had assumed would be standard.
To give a small example, Tiger Eye.
The hardness (Mohs) on three sites was given as follows:
A: 6.5 - 7
B: 5.5 - 6
And the specific density was given as:
A: 2.58 - 2.64
B: 2.64 - 2.71
C: 2.63 - 2.65
As you can see, there is quite a range in both values and I have no idea which is the 'correct' one to use.
Can they all be right (possibly variations in the stone) or is there a definitive source that could give me the actual values?