retzian
/ˈrɛtsɪən/Mineralogy
noun
A rare manganese-containing mineral which occurs as dark brown prismatic or tabular crystals.
- Retzian is an arsenate and hydroxide of manganese and cerium (sometimes with other rare earth elements), Mn2(Ce, La, Nd)AsO4(OH)4. Crystal system: orthorhombic.In more recent use often with following chemical symbol, indicating the predominant rare earth element present, as retzian-(Ce) (cerium), retzian-(La) (lanthanum), and retzian-(Nd) (neodymium)..
Origin
Late 19th century. From the name of Anders Jahan Retzius, Swedish naturalist + -an.