How do I identify Esperite?

Esperite can be identified by its hardness of 5 on the Mohs scale, White color. Look for these key characteristics when examining specimens.

What color is Esperite?

Esperite typically appears in White, off-white, pale tan. Color can vary depending on impurities and formation conditions.

How hard is Esperite?

Esperite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.

How to Identify Esperite | Properties, Meaning & Uses

What is Esperite?

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. 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 Market Value Calculator

Estimate the market value of Esperite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Esperite Localities Map

See where Esperite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.