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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.
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.