Laboratory measurements were carried out at the photometer-polarimeter of Institute of Astronomy of V.N. Karazin Kharkiv National University. Phase curves of brightness and polarization were obtained for each sample in the phase angle range from 1 deg to 20-30 deg (Lupishko D.F. and Belskaya I.N. Icarus, v. 78, p. 395, 1989). All samples were crushed and had a similar texture with particle sizes ≤50 microns. Albedos of samples were measured at the phase angle of 5 deg.