neoplase
/ˈnɪə(ʊ)pleɪz/ /ˈnɪə(ʊ)pleɪs/Mineralogy rare. Now historical
noun
A hydrated basic sulphate of iron and magnesium, now regarded as identical with botryogen.
Origin
Mid 19th century. From French néoplase from néo- + ancient Greek πλάσις moulding, conformation.