The effect of accessory minerals on the habit and composition of kimberlites

The results of a complex study of accessory minerals of kimberlites are pre sented, and their specific effect on the composition and habit of these roc ks is considered. It is shown that the major secondary minerals are serpent ine and carbonates making up the groundmass of kimberlites. All other miner als, formed at different stages of kimberlite pipe evolution, are accessory . Minerals of different classes - silicates, carbonates, oxides, hydroxides , sulfides, sulfates, halides, phosphates, berates, and bitumens - show uni que concentrations and distribution in rocks and provide different habits a nd compositions of kimberlites.