Lunar and Terrestrial Ilmenite Basalt

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Science  26 Mar 1971:
Vol. 171, Issue 3977, pp. 1245-1246
DOI: 10.1126/science.171.3977.1245


A basalt hornfels from the Keweenawan Duluth complex in Minnesota contains 7 percent by weight of titanium dioxide and is similar in many respects to the Apollo 11 samples. Hornfels texture, as well as primary textures in lunar rocks, resemble those in Keweenawan rocks.