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Pure phase, high activity ZSM-48 crystals having a SiO2/Al2O3 ratio of less than about 150/1, substantially free from ZSM-50 and Kenyaite, and fibrous morphology crystals. The crystals may further have a specific cross morphology. A method for making such crystals using heterostructural, zeolite see

Pure phase, high activity ZSM-48 crystals having a SiO2/Al2O3 ratio of less than about 150/1, substantially free from ZSM-50 and Kenyaite, and fibrous morphology crystals. The crystals may further have a specific cross morphology. A method for making such crystals using heterostructural, zeolite seeds, other than ZSM-48 and ZSM-50 seeds.

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1. Pure phase ZSM-48 crystals having a XO2/Y2O3 ratio of less than about 150/1 and free from ZSM-50 and Kenyaite impurities having a diameter of less than about 1 micron and being substantially free of fibrous morphology.2. The pure phase ZSM-48 crystals of claim 1 having a XO2/Y2O3 ratio of from ab

1. Pure phase ZSM-48 crystals having a XO2/Y2O3 ratio of less than about 150/1 and free from ZSM-50 and Kenyaite impurities having a diameter of less than about 1 micron and being substantially free of fibrous morphology.2. The pure phase ZSM-48 crystals of claim 1 having a XO2/Y2O3 ratio of from about 40/1 to about 150/1.3. The pure phase ZSM-48 crystals of claim 1 wherein X is at least one of Si and Ge and Y is at least on of Al, Ga, B, Fe, Ti, V and Zr.4. The pure phase ZSM-48 of claim 1 wherein X is Si and Y is Al.5. A method for making ZSM-48 crystals, the method comprising:mixing effective amounts of heterostructural, zeolite seeds, selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, colloidal BEA, Beta, X and Y zeolites, at least one source of a tetravalent element X, at least one source of a trivalent element Y, an alkali or alkaline earth metal M, and at least one organic template material R;to form a reaction mixture having in terms of mole ratios of oxides the following composition: and maintaining said reaction mixture under effective crystallization conditions for a time sufficient to form ZSM-48 crystals.6. The method of claim 5 wherein the organic template is selected from organic linear diquaternary alkyl ammonium compounds and linear diamino alkanes.7. The method of claim 6 wherein the effective amount of non ZSM-48 seeds is in the range of 0.01 wt ppm to about 5 wt % based on the total weight reaction mixture.8. The method of claim 7 wherein said heterostructural, zeolite seeds are selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, Beta, X and Y zeolites, and mixtures thereof.9. The method of claim 5 wherein the non ZSM-48 seeds are colloidal BEA seeds in an amount in the range of about 0.01 wt ppm to about 0.1 wt % whereby the ZSM-48 crystals have a cross morphology and crystal size of about 1 to 15 μm.10. A method for preparing a pure phase ZSM-48, the method comprising:(a) preparing a reaction mixture comprising a source of silica, a source of alumina, an alkali metal or alkaline earth metal (M), water, an organic template (R), and heterostructural zeolite seeds other than ZSM-48 and ZSM-50 seeds,wherein said mixture, in terms of mole ratios of oxides, has the following composition:SiO2/Al2O3: 30/1 to 500/1,M+/SiO2: 0.02/1 to 0.8/1,OH?/SiO2: 0.02/1 to 0.5/1,H2O/SiO2: 10/1 to 100/1, andR/SiO2: 0.005/1 to 1.0/1wherein M+ is an alkali metal; and R is the source of the organic structuring agents(b) maintaining said mixture under effective crystallization conditions until crystals of said ZSM-48 are formed.11. The method according to claim 10, wherein said mixture has the following composition ranges:SiO2/Al2O3: 40/1 to 200/1,M+/SiO2: 0.1/1 to 0.6/1,OH?/SiO2: 0.1/1 to 0.5/1,H2O/SiO2: 15/1 to 60/1, andR/SiO2: 0.01/1?0.5/1.12. The method according to claim 10, wherein the organic structuring agent is linear diquaternary ammonium compound.