Section 3(1) of the Imports and Exports (Control) Act, 1947 as amended upto 30th April, 1979 provides that: "The Central Government may, by order published in the Official Gazette, make provisions for prohibiting, restrict ing or otherwise controlling in all cases or in specified classes of cases and subject to such exceptions if any, as may be made by or under the order . . . . " Chapter 25 of Schedule I, Appendix i B of the ITC Sched ule mentions mineral products which can be imported under O.G.L. Entry No. 25.15 refers to marble which is as under: "Marble, travertine, ecaussine and other calcareous monumen tal or building stone of an apparent specific gravity of 2.5 or more and Alabaster, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape." 386 Appendix 2, Part B of the Import and Export Policy for April 1988 March 1991 enumerates the restricted items.