L-tectonite

This low metamorphic grade sample of quartzite comes from the Pilbara Craton of Western Australia. The protolith was likely a banded chert. It is now an L-tectonite dominated by a prominent stretching lineation, but has no tectonic foliation. A primary foliation (likely bedding) can be seen in an end-on view of the sample (tagged in the model). Although this is a small specimen, large outcrops of this occur in the field, where the lineation is steeply plunging. Local miners in the past have built 'log cabins' from this material for shelter. Reprocessed model uploaded 13th Feb 2021