In mineralogy terms the difference between scapolite and meionite
is that scapolite is any of several mixed sodium and calcium aluminosilicates which also contain chloride, carbonate and sulfate and are found in metamorphic rocks while meionite is a silicate mineral belonging to the scapolite group.
(mineralogy) Any of several mixed sodium and calcium aluminosilicates which also contain chloride, carbonate and sulfate and are found in metamorphic rocks