ˈpinəˌwīt noun
( -s )
Etymology: German pinnoit, from Pinno, 19th century German mining official + German -it -ite
: a hydrous magnesium borate Mg(BO 2 ) 2 .3H 2 O usually occurring in yellow nodular masses with a radiating fibrous structure (hardness 3-4, specific gravity 2.3)