Cosmetic compositions containing modified powder or particulate material

In a cosmetic composition comprising a cosmetic base and a powder, the improvement wherein such powder comprises a modified powder having a silicone polymer film coated on substantailly the entire surface thereof, said powder being produced by bringing at least one silicone compound, in the form of vapor, having the general formula (I):

• (R.sup.1 HSiO).sub.a (R.sup.2 R.sup.3 SiO).sub.b (R.sup.4 R.sup.5 R.sup.6 SiO.sub.1/2).sub.c (I)
• wherein R.sup.1, R.sup.2, and R.sup.3 represent, independently, hydrogen, a hydrocarbon residue having 1 to 10 carbon atoms or a hydrocarbon residue having 1 to 10 carbon atoms and substituted with at least one halogen atom, provided that R.sup.1, R.sup.2, R.sup.3 are not hydrogen at the same time, R.sup.4, R.sup.5, and R.sup.6 represent, independently, hydrogen, a hydrocarbon residue having 1 to 10 carbon atoms or a hydrocarbon residue having 1 to 10 carbon atoms and substituted with at least one halogen atom, a is zero or an integer of 1 or more, b is zero or an integer of 1 or more, and c is zero or 2, provided that c is 2 when a and b are simultaneously zero and a +b is an integer of 3 or more when c is zero, into contact with the powder having on the usrface thereof an active site capable of catalytically polymerizing a silicone compound having a siloxane bond (Si-O-Si) or a hydrosilyl group (Si H), whereby the silicone compound is polymerized on substantially the entire surface of the powder.