NOVELTY - New MCM-22 family molecular sieve has an X-ray diffraction pattern of as-synthesized MCM-22 family molecular sieve including d-spacing maxima at 12.4plus minus 0.25, 3.57plus minus 0.07 and 3.42plus minus 0.07 Angstrom and at least one peak of 26.6-29degrees (2theta).    USE - The molecular sieve is used as adsorbent or catalyst in hydrocarbon conversion. The conversion process includes alkylation of aromatic hydrocarbons, e.g., benzene; alkylation of reformate to provide mono- and dialkylates; alkylation of phenols; conversion of light paraffins to olefins and aromatics; conversion of light olefins to gasoline, distillate and lube range hydrocarbons; two-stage hydrocracking for upgrading hydrocarbon streams; reaction of alcohols with olefins to provide mixed ethers, e.g., the reaction of methanol with isobutene and/or isopentene to provide methyl-t-butyl ether (MTBE) and/or t-amyl methyl ether (TAM); toluene disproportionations with C9+ aromatics as co-feed; preparation of the pharmaceutically-active compound 2-(4-isobutylphenyl)propionic acid, i.e. ibuprofen; as acid-binding agent in the reaction of amines with heterocyclic fiber-reactive components in preparation of dyes; as the absorbent for separating 2,6-toluene diisocyanate (2,6-TDI) from isomers; as the absorbent for separating 2,4-TDI from its isomers; or process for decreasing the durene content of 90-200degreesC bottoms fraction obtained from the catalytic conversion of methanol to gasoline.    ADVANTAGE - The molecular sieve has high crystallinity, thick platelet morphology, low external surface area, and low mesitylene uptake and sorption rate.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) method of manufacturing an MCM-22 family molecular sieve, comprising combining at least one silicon source, at least one source of alkali metal hydroxide, at least one directing-agent (R), water, and optionally one aluminum source to form a mixture having the mole composition: Si:Al2 (10 to infinity), H2O:Si (1 to 20), OH-:Si (0.001 to 2), M+:Si (0.001 to 2), R:Si (0.001 to 0.34), where M is an alkali metal; treating the mixture at crystallization conditions for less than 72 hours to form a product having the MCM-22 family molecular sieve, where the crystallization conditions comprise 160-250degreesC; and recovering the molecular sieve; and    (2) process for hydrocarbon conversion, comprising contacting a hydrocarbon feedstock with an MCM-22 family molecular sieve under conversion conditions to form a product; and withdrawing the product.