irregulär change of PC
imaginary part of the refractive index exceeding 0.1;
• the initial mass of the organic mantle is approximately equal or less than the mass of the silicate core.
The results are in a good agreement with the study  based on analysis of evolution of interstellar and circumstellar dust, origin of comets and cosmic element abundances. Both studies resulted in core-mantle silicate-organic cometary particles with the core sizes near 0.1 pm and an almost equal mass of organics and silicates.
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