Chacko John, B. P. Glass; Clinopyroxene-bearing Glass Spherules Associated with North American Microtektites. Geology ; 2 (12): 599–602. doi: https://doi.org/10.1130/0091-7613(1974)2<599:CGSAWN>2.0.CO;2
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Crystallite-bearing glass spherules (<200 µm diam) are associated with North American microtektites in a Caribbean deep-sea core (RC9–58). X-ray and chemical data indicate that the crystalline phase is clinopyroxene (probably augite). The clinopyroxene-bearing spherules are similar in composition to bottle-green, high-magnesium microtektites. It appears that the clinopyroxene-bearing spherules were formed by the same event that produced the North American tektite strewnfield ∼35 m.y. ago.