rivotite
/ˈrɪvətʌɪt/Mineralogy. Now historical and rare
noun
An amorphous yellowish-green material consisting of oxides of antimony and arsenic, now recognized as a mixture of malachite and stibiconite.
Origin
Late 19th century; earliest use found in Geological Magazine. From French rivotite from the name of Louis-Édouard Rivot, French mineralogist + -ite.