Scanning electron microscopy of condensation related minerals : the Bjurbole meteorite

Rietmeijer, Frans J.M. & Mackinnon, Ian D.R. (1983) Scanning electron microscopy of condensation related minerals : the Bjurbole meteorite. In Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, TX, pp. 644-645.

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Abstract

Filamentary single crystals, blades, sheets, euhedral crystals and powders may form by vapor phase condensation depending on the supersauration conditions in the vapor with respect to the condensing species [1]. Filamentary crystal growth requires the operation of an axial screw dislocation [2]. A Vapor-Liquid-Solid (VLS) mechanism may also produce filamentary single crystals, ribbons and blades. The latter two morphologies are typically twinned. Crystals grown by this mechanism do not require the presence of an axial screw dislocation. Impurities may either promote or inhibit crystal growth [3]. The VLS mechanism allows crystals to grow at small supersaturation of the vapor. Thin enstatite blades, ribbons and sheets have been observed in chondritic porous Interplanetary Dust Partics (IDP's) [4, 5]. The requisite screw dislocation for vapor phase condensation [1] has been observed in these enstatite blades [4]. Bradley et al. [4] suggest that these crystals are primary vapor phase condensates which could have formed either in the solar nebula or in presolar environments. These observations [4,5] are significant in that they may provide a demonstrable link to theoretical predictions: viz. that in the primordial solar nebula filamentary condensates could cluster into 'lint balls' and form the predecessors to comets [6].

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ID Code: 58955
Item Type: Conference Paper
Refereed: Yes
Keywords: condensate formation, solar nebula, Bjurbole meteorite, vapor-liquid-solid mechanism, enstatite
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Extraterrestrial Geology (040302)
Divisions: Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 1989 please consult the author
Deposited On: 09 Apr 2013 02:11
Last Modified: 09 Apr 2013 02:19

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