An interesting molecule or allotrope, from the perspective of LENR (when lithium is involved) is LiH6 or LiD6.
In previously cited papers by Eva Zurek, et al - LiH6 is reported as the most likely candidate for a stable form of metallic hydrogen, formed under extreme pressure (but a fraction of normal). This could be related to what Holmlid is reporting as a UDD cluster following a laser pulse (Holmlid has a different explanation). The molecule could also form during electrolysis, inside the surface layer of a palladium electrode. In fact, LiD6 would be far more compact than a molecule of deuterium, for comparison. LiD6 would seem to exhibit an atomic mass of 19 amu (or 13 with protium instead of deuterium). However, if a cold fusion electrode was subjected to spectroscopy, it is unlikely that a fluorine signal would be seen, since the molecule could breakup completely under electron irradiation. The species may be easier to form with deuterons (compared to protium) for a number of reasons. There could be a minimum crystal size for unpressurized stability, possibly of 5 molecules, resulting in an apparent mass of 95 amu and it is likely that this molecule is only stable inside a matrix of a host material - which in the case of Holmlid is hematite, or in cold fusion it is palladium. The ability for lithium to become effectively hexavalent under pressure (or shock, in the case of Holmlid) is difficult to explain, even realizing that charge density is a function of distance. If the connection of decreased separation distance to increased charge density is a reality which is mediated by nuclear spin, then it seems to reinforce the notion that ultra-high spin could be coming via the SPP interaction and this spin allows the same charge to appear greater by a factor of 6. In effect, the interaction with SPP could be like spinning a top in two dimensions, forcing the lithium nucleus to express much higher effective positive charge density than normal, so that dense deuterium negative ions (also formed via SPP interaction) can substitute for electrons in a tightly bound stable unit. which surprisingly is of the correct dimensions such that the entire structure will fit easily in the interstices of the palladium matrix! One datum which would serve as evidence for this hypothesis is determination of the specific gravity of an active cold fusion electrode. Full loading of deuterium (at a 1:1 ratio) does not increase the specific gravity of palladium more than two percent, but loading with Li6 should increase the specific gravity by much more - an order of magnitude more (20%) is possible. In practice, in a working cathode there would be both, and the measured specific gravity would indicate the balance point.
