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Opaque minerals in lunar samples.

E N Cameron

    Science (New York, N.Y.)
    |January 30, 1970
    PubMed
    Summary
    This summary is machine-generated.

    Microscopic and electron microprobe analysis of lunar rocks reveals unique mineral assemblages, including titanochromite. These findings suggest formation in a strongly reducing environment with varied cooling rates.

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    Area of Science:

    • Lunar geology
    • Mineralogy
    • Geochemistry

    Background:

    • Lunar rocks and soil contain various opaque minerals.
    • Understanding mineral assemblages provides insights into formation conditions.

    Purpose of the Study:

    • To characterize the opaque mineral assemblage in lunar samples.
    • To determine the formation environment and conditions of lunar rocks.

    Main Methods:

    • Microscope study of lunar rocks and soil.
    • Electron microprobe analysis (EMPA) of mineral compositions.

    Main Results:

    • Identified ilmenite, troilite, native iron, ulvöspinel, titanochromite (new mineral), an unidentified Ti-Fe oxide, and a Zr-Y silicate.
    • The mineral assemblage indicates a strongly reducing environment.

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  • Rock textures and proportions suggest they are not from a single differentiation series.

    • Conclusions:

    • The restricted opaque mineralogy points to a narrow compositional range for the parent liquids.
    • Textural variations likely reflect differences in cooling rates and depths of formation.