Thoroughly grease a 10 x 4-inch tube pan. Mix 2/3 cup sugar and I tablespoon cinnamon. Cut biscuits in quarters. Roll each piece in sugar mixture. Arrange about one-fourth of the biscuit pieces and one-fourth of the blueberries in an even layer in pan. Place blueberries between biscuit pieces, creating a mosaic effect. Repeat three more times with remaining biscuits and blueberries, covering blueberries of one layer with biscuits in next layer to avoid a column of blueberries. In saucepan combine sugar, margarine, vanilla, cinnamon and the additional I cup blueberries. Bring to a boil, reduce heat. Cook, stirring frequently until sugar is dissolved and margarine melted. Pour over biscuits in pan. Bake in a preheated 350 degree F oven for 65 minutes or until done. Lift or turn out onto cake plate. Yield 8 to 10 servings. Posted to Fabfood By Lisa July-1998 Recipe by: http://www.gingerich.com/BerryList.html By Mary Wilson Posted to MM-Recipes Digest V4 #2 by "Gene Mayo" on Dec 29, 1998