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Domain twinning of laihunite has been investigated based on diffracton phenomena,andits crystal structure has then been refined.Space group with respect to the domain is P2_1/c,andcell parameters a=5.813,b=4,812,c=10.211(A),β=90.87°.Atomic coordinate and bondlength have been recalculated.Discussions are made of the Fe~(2+)distribution,lattice distor-tion,degree of order of laihunite and the relationship of this mineral with fayalite andferrifayalite.The authors still hold that laihunite should be considered as a new silicatemineral with dominant Fe~(3+)and less amount of Fe~(2+).
Domain twinning of laihunite has been investigated based on diffracton phenomena, and the crystal structure has then been refined. Space group with respect to the domain is P2_1 / c, and cell parameters a = 5.813, b = 4,812, c = 10.211 (A) = 90.87 ° .Atomic coordinate and bondlength have been recalculated. Discussions are made of the Fe 2+ distribution, lattice distor tion, degree of order of laihunite and the relationship of this mineral with fayalite andferrifayalite.The authors still hold that laihunite should be considered as a new silicatemineral with dominant Fe ~ (3+) and less amount of Fe ~ (2+).