The Chemistry, Properties and Tests of Precious Stones (Esprios Classics) - Bog af John Mastin - Paperback

The Chemistry, Properties and Tests of Precious Stones (Esprios Classics) - John Mastin

\What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may be considered precious at one time, may cease to be so at another.There are, however, certain minerals which possess distinctive features in their qualities of hardness, colour, transparency, refractability or double refractability to light-beams, which qualities place them in an entirely different class to the minerals..