Natural NaAlSi3O8-Hollandite in the Shocked Sixiangkou Meteorite

Details Natural NaAlSi3O8-Hollandite in the Shocked Sixiangkou Meteorite Natural NaAlSi3O8-Hollandite in the Shocked Sixiangkou Meteorite

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...287.1633g&link_type=abstract

Science, Volume 287, Issue 5458, pp. 1633-1636 (2000).

Physics

33

Scientific paper

The hollandite high-pressure polymorph of plagioclase has been identified in shock-induced melt veins of the Sixiangkou L6 chondrite. It is intimately intergrown with feldspathic glass within grains previously thought to be ``maskelynite.'' The crystallographic nature of the mineral was established by laser micro-Raman spectroscopy and x-ray diffraction. The mineral is tetragonal with the unit cell parameters a = 9.263 +/- 0.003 angstroms and c = 2.706 +/- 0.003 angstroms. Its occurrence with the liquidus pair majorite-pyrope solid solution plus magnesiowüstite sets constraints on the peak pressures that prevailed in the shock-induced melt veins. The absence of a calcium ferrite-structured phase sets an upper bound for the crystallization of the hollandite polymorph near 23 gigapascals.

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