Naked Science Forum
Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: endgamex on 15/11/2010 21:28:28
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Hello there, I've just been looking at a thin section of peridotite through crossed polars and in my workbook it says 'Extinction (to cleavage) n/a'. So I studied the olivine a bit more and granted it just seems to change interference colours not actually go into extinction. I can't figure out why this is though. I thought it might be because it has no cleavage but neither does quartz and that has a wavy extinction.
Thanks for any replies
Sarah