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Dear Mats, the following reference might help: Lofgren, G. (1974). An experimental study of plagioclase crystal morphology: isothermal crystallization. American Journal of Science, 274, 243-273. Cheers Axel >Content-Type: text/plain; charset="us-ascii"; format=flowed > > >Listmembers, > >I am working on pseudotachylyte-like veins from a gabbro in the >high-pressure zone of the Western Gneiss Region, Norway. These veins show >fine-grained (1-100 micrometer) and highly skeletal or 'flowershaped' >grains of grt, cpx, dol, omph, amph, and bi. Conventional >geothermobarometry yield eclogite-facies conditions for assemblages in >these veins. > >If anyone has suggestions to references concerning >crystallization/recrystallization processes (both crystallization from a >melt and metamorphic recrystallization) that may lead to the formation of >highly skeletal, dendritic, or 'flowershaped' crystals, I would be very >grateful. > >Many thanks, Mats. > > > > > >Mats G. Lund >Mineralogical-Geological Museum, >University of Oslo >P.O. Box 1172 Blindern >N-0318 Oslo, Norway ><html><div>Listmembers,</div> ><br> ><div>I am working on pseudotachylyte-like veins from a gabbro in the >high-pressure zone of the Western Gneiss Region, Norway. These veins show >fine-grained (1-100 micrometer) and highly skeletal or 'flowershaped' >grains of grt, cpx, dol, omph, amph, and bi. Conventional >geothermobarometry yield eclogite-facies conditions for assemblages in >these veins.</div> ><br> ><div>If anyone has suggestions to references concerning >crystallization/recrystallization processes (both crystallization from a >melt and metamorphic recrystallization) that may lead to the formation of >highly skeletal, dendritic, or 'flowershaped' crystals, I would be very >grateful.</div> ><br> ><div>Many thanks, Mats.</div> ><br> ><br> ><br> > ><br> ><br> ><font size=2 color="#000080"><b><i>Mats G. >Lund</b></i><x-tab> </x-tab><x-tab>   >; </x-tab><x-tab>   >; </x-tab><x-tab>   >; </x-tab><x-tab> </x-t >ab><br> >Mineralogical-Geological Museum,<br> >University of >Oslo<x-tab> </x-tab><x-tab> & >nbsp; </x-tab><x-tab> & >nbsp; </x-tab><br> >P.O. Box 1172 Blindern<br> >N-0318 Oslo, Norway</font></html> Axel Brunsmann Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 D-69120 Heidelberg Germany Tel.: ++49-(0)6221-546080 Fax: ++49-(0)6221-544805 e-mail: [log in to unmask]