Definition of retgersite in US English:
retgersite
noun
Mineralogy
A hydrated form of nickel sulphate which occurs as a secondary mineral associated with nickel ores, typically in the form of dark green crusts and tufts.
Origin
1940s. From the name of J. W. Retgers, Dutch chemist and crystallographer + -ite.
Pronunciation
retgersite
/ˈrɛtɡəzʌɪt/