Exsolved kirschsteinite in angrite LEW86010 olivine

• Main Authors: Miyamoto, Masamichi, Mckay, Gordon, Takeda, Hiroshi, Mikouchi, Takashi, Mori, Hiroshi
• Format: Other/Unknown Material
• Language: unknown
• Published: 1993
• Subjects: ASTROPHYSICS; Antarctic; Antarc*
• Online Access: http://hdl.handle.net/2060/19940011937

Mineralogy of kirschsteinite exsolution in olivine from Antarctic meteorite LEW86010 has been studied by single crustal X-ray diffraction technique. The LEW86010 olivine crystals have exsolution lamellae of kirschteinite about 15 microns wide. Determination of crystallographic orientation of exsolved kirschsteinite in an olivine grain has been made. Weak reflections of exsolved kirschsteinite share common crystallographic orientation with the host olivine. The cell dimensions of the exsolved phase (a - 4.87 plus or minus 0.05A, b - 11.14 plus or minus 0.10A, c - 6.36 plus or minus 0.05A) and intensities were in well accord with those of kirschsteinite previously reported. Oriented section perpendicular to the a axis shows exsolution lamellae in two directions parallel to (031) and (031). The lamellae are up to 10 microns in width and spacings between them are usually 50-100 microns.