Crystal and stones » Precious stones & minerals

Origin of precious stones

precious stones — Sun, 25 Apr 2010 18:02:40 +0000

All precious stones are transparent, or at least translucent, from which it may be concluded that the matter of which each consists is homogeneous. Now this homogeneity could never have been attained by the mixture of their elements in the solid state, however finely these may have been pulverized, and hence they must have been [...]

Origin of precious stones

precious stones — Wed, 16 Sep 2009 12:45:01 +0000

Though the origin, formation, composition, characteristics and tests of each stone will be examined in detail when dealing with the stones seriatim, it is necessary to enquire into those particulars of origin which are common to all, in order thoroughly to understand why they differ from other non-metallic and metallic minerals.

At the very commencement [...]

Precious stones

precious stones — Wed, 16 Sep 2009 11:09:08 +0000

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 [...]