Abstract
Maskelynite occurs in the rocks of the central peaks of Clearwater West and Mani-couagan craters, Quebec, Canada. Optical, X-ray and infrared absorption properties are similar to those of maskelynite in the Shergotty meteorite and in an artificially shocked gabbro. Heated maskelynite reverts to crystalline plagioclase, indicating only slight structural disordering unlike fused plagioclase glass. Experimental evidence suggesting that more than 50 kilobars shock pressure is required to form maskelynite, supports a meteorite impact origin for the craters.
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