XAGA
Xaga is a type of obsidian
found in California, USA.
XALOSTOCITE Xalostocite is a
pink grossular garnet that
is found in a matrix of white
marble. Xalostocite is found
in Xalostoc, Mexico.
XENOLITH
A xenolith (also called an
inclusion) is a fragment of
foreign rock that is embedded
inside an igneous rock.
XYLOID JASPER
Xyloid jasper is jasperized
wood (petrified wood). It
is wood that has fossilized
- all the original chemicals
have been replaced with minerals,
making a stone-like replica
of the original wood.