rhodusite
/ˈrəʊdəsʌɪt/Mineralogy
noun
An amphibole mineral occurring as elongated or asbestos-like dark blue fibres, and now identified with magnesioriebeckite.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From German Rhodusit from classical Latin Rhodus, the name of Rhodes + German -it.