Analyzing the Polyhedral Shape of Mineral Inclusions in Diamond Crystals Using Goniometric Data

Drawing from our research and an extensive review of publications, we have compiled data from goniometric studies concerning the morphology of mineral inclusions in diamonds sourced from both kimberlites and placers. Specifically, we have examined the morphology of olivine, garnet, and chrome-spinelide inclusions. In the majority of instances, the crystalline shape of these mineral inclusions has been instrumentally confirmed to mirror that of diamonds. The formation of such shapes is attributed to the influence of the negative morphology of diamond crystals, the host mineral, on mineral inclusions. The shape of these inclusions reflects various features of diamond morphology, encompassing simple forms, habits, outlines, and surface topography of faces. Compelling evidence supporting the syngenesis of mineral inclusions with diamond-shaped crystals and the diamonds within which they are found lies in indicators of their simultaneous growth. These indicators include the presence of induction pseudo-edges, pseudo-faces, and pseudo-vertices on inclusion crystals.