A
piece of foriegn rock enclosed within an igneous
rock. The foriegn rock is usually picked up from
the walls surrounding the igneous rock and is
frozen in place before it has a chance to melt.
(iinclusion).
X-Ray
Diffraction (XRD)
A
method of analyzing the structure of a mineral
by examining the pattern created when x-rays
are passed through a crystal of the mineral.