mesotype
/ˈmɛsə(ʊ)tʌɪp/Mineralogy
noun
A zeolite mineral originally regarded as a single species but later resolved into several distinct species, including natrolite, mesolite, scolecite, and thomsonite (members of the natrolite group); these minerals collectively.
Origin
Early 19th century; earliest use found in The Edinburgh Review. From French mésotype from méso- + -type (so called because it was regarded as intermediate between analcite and stilbite).