Wikipedia
Esperite is a rare complex calcium lead zinc silicate (PbCaZn(SiO)) related to beryllonite and trimerite that used to be called calcium larsenite. It was named in honor of Esper F. Larsen Jr. (1879–1961), petrologist of Harvard University.
Esperite has a white, greasy appearance in daylight and is much prized for its brilliant yellow green fluorescence under shortwave ultraviolet light. It is found in association with calcite, franklinite, willemite, hardystonite and clinohedrite. It has also been found as prismatic crystals up to 1 mm in length at the El Dragon Mine, Potosi, Bolivia in association with allophane, chalcomenite, clinochalcomenite and barite.
Usage examples of "esperite".
But it seems they are showing subtle signs of having been affected by the esperite we were exposed to before we landed on Trewsworld.
He'd spent his two days reviewing his initial observations of what he had begun to call the Esperite Effect, and writing up his recent experiences.
Foiled, esperite, he thought, picking his way over a jagged section of broken rock.