A new family of crystalline microporous high charge density silicometallophosphates has been synthesized. These silicometallophosphate are represented by the empirical formula of: Rp+ rMm +ExPSiyOz where M is an alkali metal such as potassium, R is any quaternary ammonium cation such as ethyltrimethylammonium and E is a trivalent framework element such as aluminum or gallium. This family of high charge density silicometallophosphate molecular sieves has catalytic properties for carrying out various hydrocarbon conversion processes and separation properties for separating at least one component.