The crystal chemistry of armalcolites from Apollo 17

Details The crystal chemistry of armalcolites from Apollo 17 The crystal chemistry of armalcolites from Apollo 17

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..24..262s&link_type=abstract

Earth and Planetary Science Letters, vol. 24, no. 2, Dec. 1974, p. 262-270.

Computer Science

3

Apollo 17 Flight, Crystal Structure, Lunar Composition, Lunar Soil, Chromium Oxides, Magnesium Oxides, Optical Properties, Single Crystals, X Ray Analysis

Scientific paper

Single-crystal X-ray studies of armacolites from the 2 to 5 mm fraction of Apollo 17 soils 75082 and 78502 are evaluated. The two types of armacolites studied show slight composition differences and identical structures. Precession photographs of each crystal show the two forms, ortho and para, to have the same space group and nearly the same cell dimensions. The analyses conducted support the proposition that the difference in optical properties is caused by differing MgO and Cr2O3 contents.

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