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Please let me know if you have any ideas about that other photo.The material will not allow controlled fractures and is generally useless for biface manufacture, although flakes can be removed on the more vitreous materials. This source was not apparent in any of the sites in this study. There appears to be some prehistoric reduction here, but the density is light and many 'flakes' could have been produced by freeze-thaw processes. Published references include Jack (1971), Moore et al. 1960, Robinson (1913), and Schreiber and Breed (1971).
Harder than obsidian, but carbide scratched it. Besides the tiny square crystals (maybe pyrite?), there were some black thread-like crystals on the other side. They were very fine; about half the thickness of a hair.PageRob wrote:As to the green rock - I have no idea. Was it hard? Did you try to scratch it?