Keith, Jack has mentioned his experiments with multiple deliberate episodes of cooking quartzite between thinning stages with incidental reference to color changes, some of which may have had ritualistic bearing within the cultures of their day (think of the widespread usage of red ochre in prehistoric burial rites) - the technical factors playing into the context of our overall practice. I'm intrigued by what appear to be 'islands' of pale high zones especially evident in the edge-view shot contrasted with the facial image, which prompt me to wonder about the effect of heating of laminated stones (and this eastern quartzite knapper has seen this structural pattern more times than is warranted). I'll keep this in mind when I catch up with him. I'm writing a list of topical issues and questions to review with him concerning this piece - he's my primary resource for the details since he introduced me to its existence as a focal point.
I feel that it warrants some deeper inquiry, especially for those of us who are willing to put the information to work... this may be worthwhile as a separate topic even if only consisting of a few posts, at least out of respect for this one which I've detoured beyond reasonable tolerance... sorry about that, friends. Let's see what information may be forthcoming - and to the more expansive community of traditional knappers looking to see What's Been Knapped Today, thanks for your patience during this sidebar excursion.
And, if anything has been published on this artifact I am ignorant of it or else I'd be quoting from it. Further, although I possess no casts of any artifacts, this would be the one I would require due to its referential relevance to my prefered practice... if ever there was an intriguing artifact to cast, this would be one. Given the current catalog I can think of some which are represented due to their 'Top-10' pop-value which may be appraised more for visual appeal than technological challenge. For 'Alternative Traditional Knapping' this would certainly be one worth studying toward replication.