“…Structural details of the orthorhombic phase have been reported (Bunn, 1939;Hengstenberg, 1928;King and Garner, 1936;Muller, 1928Muller, , 1929aMuller, , 1930Muller and Saville, 1925;Smith, 1932Smith, , 1953Teare, 1959;Vainshtein and Pinsker, 1951;Vand, 1953;Wyckoff, 1960). The .subcell is orthorhombic.…”