Abstracts Travel
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Experimental growing model of fibrous diamond crystals

Afanasyev V.P., Chepurov A.I., Sonin V.M.

Institute of Geology and Mineralogy, SB RAS, Russia, Novosibirsk



There are two known base growth mechanism for natural diamonds – lamellar or tangential in situation of low saturation in carbon, and fibrous or normal in condition of oversaturation by carbon. We obtained an experimental confirmation for the second case. A growth apparatus became disconnected during the standard procedure of high quality diamond crystal growing and the system was undergone of rapid cooling. As a result a fully black opaque diamond crystals composed by subparallel pillar subindivides oriented by <111>  were formed (Fig.1).  A pillar heads are composed by octahedral and rhombododecahedral faces, and the last is presented in equal role with octahedral faces or predominate in the face complex.




Fig. 1. A diamond crystal had grow up on the seed under rapid cooling.


Appearance of rhombododecahedral faces, low quality of crystal and its pillar morphology can be explained as a result of rapid growth in conditions of significant oversaturation of carbon and presence some amounts of water and hydrocarbons in the system.