The Collaborative International Dictionary
Scapolite \Scap"o*lite\ (sk[a^]p"[-o]*l[imac]t), n. [Gr. ? a staff, or L. scapus a stem, stalk + -lite: cf. F. scapolite.] (Mon.) A grayish white mineral occuring in tetragonal crystals and in cleavable masses. It is essentially a silicate of alumina and soda.
Note: The scapolite group includes scapolite proper, or wernerite, also meionite, dipyre, etc.
Wiktionary
n. (context mineralogy English) Any of several mixed sodium and calcium aluminosilicates which also contain chloride, carbonate and sulfate and are found in metamorphic rocks
Wikipedia
The scapolites (Gr. asairos, rod, stone) are a group of rock-forming silicate minerals composed of aluminium, calcium, and sodium silicate with chlorine, carbonate and sulfate. The two endmembers are meionite (CaAlSiOCO) and marialite (NaAlSiOCl). Silvialite (Ca,Na)AlSiO(SO,CO) is also a recognized member of the group.
Usage examples of "scapolite".
Scapra: This name is given to the finest scapolite stones: pale to medium yellow fancy stones that are soft and easy to cut into facets, but also too soft for use in rings or on clothing.