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After isolating the new gas, the first of the noble gases to be discovered, the scientists named it argon ("the inactive one") and found it made up almost one percent of air. A large hall may easily contain a greater weight of it than a man can carry." Argon is a noble gas.
Quartz breaks in curvy and irregular shapes (conchoidal fracture).
So the identity of the X depends on how many bonds are needed to make up the total of 16. The first is alkali feldspar and the second is plagioclase feldspar.
Alkali feldspar has the formula KAl Si, potassium aluminosilicate.
It is, however, not completely inert - photolysis of hydrogen fluoride in a solid argon matrix at 7.5 kelvin yields argon fluorohydride, HAr F.
Argon forms no stable compounds at room temperature.
In fact, feldspar is the standard for hardness 6 in the Mohs scale.