Pierre et carrières dans la Saintonge antique : identification, usages et diffusion by Jacques Gaillard, Egle Conforto

“…Scanning electron microscope analysis reveals a mass of grains composed mainly of pure silica, with a minority of other more remarkable grains, wherein silica has combined with elements such as aluminium, potassium and iron. Other grains containing elements such as titanium or zirconium also occasionally appear independently. …”
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