Based on the heterogeneity in the contents and isotopic compositions of car
bon, nitrogen, and rare gases found in different (in grain size) interstell
ar diamond fractions of the meteorite Efremovka, we discuss issues associat
ed with the nature of the diamond, the distribution of the isotopic compone
nts of impurity chemical elements in it, and the kinetics of their release.
(C) 2001 MAIK "Nauka/Interperiodica".