We don't have synonyms for mesotype yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are genotype, melotype and monotype.
(n) :
(mineralogy, obsolete) Any of various minerals, including natrolite (soda mesotype), scolecite (lime mesotype), and mesolite (lime-soda mesotype)
(n) :
(mineralogy, obsolete) Any of various minerals, including natrolite (soda mesotype), scolecite (lime mesotype), and mesolite (lime-soda mesotype)