Abstract
We examine the behavior of triplet muonium in crystalline quartz, with attention to the quadrupolar deformation of the ground state interacting with the lattice. Detailed features are predicted and discussed in the context of muonium spin-precession experiments. The roles of "intrinsic" versus lattice-induced deformation are discussed. No model-independent conclusion can be drawn as to which effect gives the dominant interaction energy in quartz, but there is a hint that the intrinsic effect is larger.

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