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The lithium content of the gem mineral, Sugilite, was determined by promt alpha spectrometry from the reaction7Li (p, α)4He with 1000 keV protons, and by proton-induced prompt photon spectrometry (PIPPS) of the 479-keV7Li, p(1,0) gamma-ray excited by 1000 and 4500 keV protons and 429-keV7Li n(1,0) gamma-ray induced by 4500 keV protons. The lithium content was found to be 3.72±0.06% by mass as Li2O. Simulated mineral matrices were used as standards.

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