Crystal forms of natural microdiamonds |
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| Affiliation: | 1. Advanced Materials Laboratory, Sumitomo Electric Industries Ltd., 1-1-1 Koyakita, Itami, Hyogo 664-0016, Japan;2. Coherent X-Ray Optics Laboratory, RIKEN Harima Institute, Sayo, Hyogo 679-5148, Japan;3. Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan;1. Institute for Bioengineering of Catalonia (IBEC). 15-21 Baldiri Reixac 08028 Barcelona, Spain;2. Physical Chemistry Department, University of Barcelona (UB), 1-11 Martí i Franquès, 08028, Barcelona, Spain;3. Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN);4. Institució Catalana de Recerca i Estudis Avançats (ICREA);1. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva 13, Novosibirsk, Russian Federation;2. Novosibirsk State Technical University, K. Marx Avenue, 20, Novosibirsk, Russian Federation;1. Laboratorio de Psicobiología, División de Neurociencias, Centro de Investigación Biomédica de Occidente, IMSS, Guadalajara, Jal., Mexico;2. Instituto de Ciencias de la Rehabilitación Integral, Puebla, Pue., Mexico;3. Universidad Politécnica de la Zona Metropolitana de Guadalajara, Tlajomulco de Zúñiga, Jal., Mexico;4. Centro Universitario del Norte, Universidad de Guadalajara, Colotlán, Jal., México;1. School of Gemology, China University of Geosciences, Beijing 100083, China;2. Jewelry and Mineral Materials Laboratory of Experimental Teaching Demonstration Center, Beijing China;3. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China;4. Adam Mickiewicz University, Faculty of Chemistry, Department of Rare Earths, Umultowska 89b, 61-614 Poznań, Poland |
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| Abstract: | Geometrical crystallographic features of rare diamond micro-crystals (0.3–0.5 mm in diameter) from kimberlites having different complex flat and smooth faces are described. Such polyhedrons of microdiamonds are typically composed of two or more combinations of seven different crystal forms belonging to hexoctahedral symmetry class: octahedron, cube, rhombic dodecahedron, trisoctahedron, trapezohedron, tetrahexahedron and hexoctahedron. Many of them are not yet known for macro-crystals of this mineral. All these forms are found as small faces on the octahedral crystals. Both flat and smooth faces of octahedron and cube on such crystals have their own growth sectors. Flat faces of rhombic dodecahedron, different trisoctahedrons, trapezohedrons and hexoctahedrons occur as so-called faces of degeneration of octahedral growth planes. Nature of tetrahexahedron flat faces is not clear. An investigation of the complex diamond polyhedrons should give a new idea on crystal morphology of diamond, make more precise its symmetry and be important for the explanation of the nature of diamond on the whole. |
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