  Nominally anhydrous minerals (NAMs) composing Earth's and planetary rocks
incorporate microscopic amounts of volatiles. However, volatile distribution in
NAMs and their effect on physical properties of rocks remain controversial.
Thus, constraining trace volatile concentrations in NAMs is tantamount to our
understanding of the evolution of rocky planets and planetesimals. Here, we
present a novel approach of trace-element quantification using micro-scale
Nuclear Magnetic Resonance (NMR) spectroscopy. This approach employs the
principle of enhanced mass-sensitivity in NMR microcoils formerly used in
\textit{in-situ} high pressure experiments. We were able to demonstrate that
this method is in excellent agreement with standard methods across their
respective detection capabilities. We show that by simultaneous detection of
internal reference nuclei, the quantification sensitivity can be substantially
increased, leading to quantifiable trace volatile element amounts of about $50$
wt-ppb measured in a micro-meter sized single anorthitic mineral grain, greatly
enhancing detection capabilities of volatiles in geologically important
systems.
