A study of natural and artificial selenides, mainly by microscopic and x-ray methods, has led to revised descriptions of the selenide minerals. The mineral descriptions contain some new measurements of specific gravity, new unit cell dimensions (notably for eucairite, crookesite, and umangite), together with x-ray powder data for all the species and reproductions of the patterns. The classification of the selenides given in Dana (1944) is modified by the addition of a tetragonal group to the A2X type, and the recognition of an A2−xX type.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.