milarite
/mɪˈlɑːrʌɪt/Mineralogy
noun
A hexagonal silicate, K2Ca4Al2Be4Si24O60·H2O, that occurs especially in pegmatites as colourless to pale green prismatic crystals and fibrous aggregates.
Origin
1930s; earliest use found in American Mineralogist. From German Milarit from the name of Val Milar, a valley in the Swiss Alps + -it.