Thank you, Paul! Now, one very unhistorical observation and one further
question. The use of chert in making potterty would appear to be a
natural progression from chipping it to make tools. The question is: Is
all chert of a standard hardness and composition? The chert we
encountered was a glassy black, but I have seen arrow heads that were a
brown colour.
I can certainly see its usefulness in glass making and glazing.
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