ArticlesSpecial Mineral Studies

Iron-Titanium Oxides and Olivine from 10020 and 10071

Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 613-615
DOI: 10.1126/science.167.3918.613


A new mineral (approximately Fe0.5Mg0.5Ti2O5) related to the pseudobrookite series has been discovered in section 10071,28. Electron-probe analyses for this mineral, a coexisting ilmenite, and a chromian ulvöspinel-ilmenite assemblage in section 10020,40 indicate crystallization under highly reducing conditions. Analytical and optical absorption studies of the olivine in 10020 show it to contain unusually high Cr (1400 parts per million) probably as Cr2+.