Brilliant yellow fluorescence under SW UV; kelly green cathodoluminescence.
References
[2][3][4]
Esperite is a rare complex calcium lead zinc silicate (PbCa3Zn4(SiO4)4) 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.[clarification needed]
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.
Esperite is a rare complex calcium lead zinc silicate (PbCa3Zn4(SiO4)4) related to beryllonite and trimerite that used to be called calcium larsenite....
calcite, the green fluorescence of willemite, the yellow fluorescence of esperite, and the orange fluorescence of wollastonite and clinohedrite. Hexavalent...
associated with hardystonite are franklinite, diopside, andradite garnet, and esperite (fluoresces yellow). It was first described in 1899 by J.E. Wolff, when...
vertical shaft just under Franklin Falls. Other rare minerals include esperite, clinohedrite, hardystonite, and others. There are scores of minerals found...
professor of petrology at Harvard University from 1923 to 1949. The mineral Esperite (earlier called Calcium Larsenite) was named after him. Larsen was born...
(IMA) Eskolaite: Cr2O3 – Finnish geologist Pentti Eelis Eskola (1883–1964) Esperite: PbCa3Zn4(SiO4)4 – American petrologist Esper S. Larsen Jr. (1879–1961)...