ralstonite
/ˈrɔːlstənʌɪt/ /ˈrɔːlst(ə)nʌɪt/Mineralogy
noun
A fluoride mineral which occurs as colourless or white, transparent to translucent crystals, chiefly as an alteration product of cryolite.
- Ralstonite is a hydrated fluoride and hydroxide of sodium, magnesium, and aluminium, NaMgAl(F,OH)6·H2O. Crystal system: cubic..
Origin
Late 19th century. From the name of J. Grier Ralston, amateur mineralogist, who discovered the mineral + -ite.