ˈpektəˌlīt noun
( -s )
Etymology: German pektolith, from Greek pēktos compacted (from pēgnynai to fix, fasten) + German -lith -lite — more at pact
: a whitish or grayish monoclinic mineral NaCa 2 Si 3 O 8 (OH) consisting of a basic sodium calcium silicate occurring in crystal aggregates or fibrous masses (hardness 5, specific gravity 2.68-2.78)