I am so sorry Mia Culpa! I was covering writing several articles tonight and had a computer glitch along with a brain freeze. I lost something in the process. What I should have said was:
"Ringwoodite" a mineral and is the spinel polymorph of olivine. "Maskelynite" is not a mineral but a glass derived from feldspars that have been shock melted. "Smectite" also not a mineral, is a broad term covering the mostly clay substance (e.g feldspar weathering products)in terrestrial slickensides. I suspect that the material in slickensides from meteorites will also fall under the classification smectite. Thanks for paying attention! Elton --- [EMAIL PROTECTED] wrote: > Hi Elton, > > you are right with the slickensides. But some > comments on Maskelynite: > It is NOT from olivine ! it is a glassy mineral > which has a composition of plagioclase feldspar. It > results from quenching from shock induced melt ! > ref: > http://www.lpi.usra.edu/meetings/metsoc99/pdf/5047.pdf > > Harald ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
