Abstract
Yellow cuboid diamonds are commonly found in diamondiferous alluvial placers of the Northeastern Siberian platform. The internal structure of these diamonds have been studied by optical microscopy, X-Ray topography (XRT) and electron backscatter diffraction (EBSD) techniques. Most of these crystals have typical resorption features and do not preserve primary growth morphology. The resorption leads to an evolution from an originally cubic shape to a rounded tetrahexahedroid. Specific fibrous or columnar internal structure of yellow cuboid diamonds has been revealed. Most of them are strongly deformed. Misorientations of the crystal lattice, found in the samples, may be caused by strains from their fibrous growth or/and post-growth plastic deformation.
Highlights
Diamond crystals develop diverse morphological and physical properties, which reflect the variation of conditions during diamond formation which largely occurs in the upper mantle [1,2,3,4,5,6,7,8,9].Morphology and internal structure of natural diamond crystals reflect the conditions of growth and following post-growth history
This study investigates the specific features related to the internal structures of these cuboid diamonds and is part of an extensive study of alluvial diamonds from the Northeastern
The internal structure of yellow cuboid diamonds found in alluvial placers of the Northeastern
Summary
Diamond crystals develop diverse morphological and physical properties, which reflect the variation of conditions during diamond formation which largely occurs in the upper mantle [1,2,3,4,5,6,7,8,9]. Morphology and internal structure of natural diamond crystals reflect the conditions of growth and following post-growth history. The study of mineral inclusion in diamonds and xenoliths of diamondiferous rocks in kimberlites show that diamonds can be crystallized in various upper mantle rocks: peridotites (olivine, orthopyroxene, garnet, and diopside), eclogites (garnet, clinopyroxene) and, rarely, websterites [10,11,12].
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