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pectolite

noun
pec·​to·​lite | \ˈpektəˌlīt\
plural -s

Definition of pectolite 

: a whitish or grayish monoclinic mineral NaCa2Si3O8(OH) consisting of a basic sodium calcium silicate occurring in crystal aggregates or fibrous masses (hardness 5, specific gravity 2.68–2.78)

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History and Etymology for pectolite

German pektolith, from Greek pēktos compacted (from pēgnynai to fix, fasten) + German -lith -lite

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