bīˈdeˌlīt noun
( -s )
Etymology: Beidell, locality in Colo. + English -ite
: a mineral ideally Ca 0 . 16 Al 3 Si 3 . 17 O 10 (OH) 2 that is a common constituent of certain clays and consists of basic aluminosilicate with exchangeable calcium, sodium, or other cation