ArticlesSpecial Mineral Studies

Opaque Minerals of the Lunar Rocks and Dust from Mare Tranquillitatis

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 615-618
DOI: 10.1126/science.167.3918.615

Abstract

The opaque minerals in the lunar rocks 10047, 10050, 10057, 10059, 10068 and in the dust were studied. Rock 10047 contains ilmenite as a main component besides Al-bearing chromian ulvöspinel, a new Ti, Fe, Zr, Y, Ca silicate, troilite, cobaltian α Fe, minor hafnian baddeleyite and dysanalyte. Dysanalyte contains Ca, Ti, and Fe as major elements and shows concentrations (rare earth elements together ≈ 10 percent) of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Hf, Y, and Zr plus traces of Nb, Ba, and Na. The chemistry of ilmenite in the igneous rocks shows no appreciable variations. A new mineral of the solid solution series MgTi2O5-FeTi2O5 has also been encountered in the polymict breccias. The microbreccias and the fines contain meteorite debris indicating an impact origin.

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