pectolite
/ˈpɛktəlʌɪt/Mineralogy
noun
A whitish or greyish mineral of the pyroxenoid group which occurs in igneous rocks in aggregates of needle-like crystals and consists of a basic silicate of calcium and sodium.
Origin
Early 19th century; earliest use found in Edinburgh Journal Science. From German Pektolith from ancient Greek πηκτός congealed + German -lith.