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A perovskite-type catalyst consisting essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.a-x B.sub.x M0.sub.b, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from Bastnasite; B is a

A perovskite-type catalyst consisting essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.a-x B.sub.x M0.sub.b, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from Bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x<0.7. Methods for preparing the perovskite-type catalyst are also described.

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[ What is claimed is:] [1.] A perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula: EQU A.sub.a-x B.sub.x M0.sub.b reinA is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasiteB is a dival

[ What is claimed is:] [1.] A perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula: EQU A.sub.a-x B.sub.x M0.sub.b reinA is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasiteB is a divalent or monovalent cation;M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80;a is 1 or 2;b is 3 when a is 1 or b is 4 when a is 2;and x is a number defined by 0.ltoreq.x<0.7. [27.] A perovskite-type metal oxide compound represented by the general formula: EQU A.sub.a-x B.sub.x M0.sub.b reinA is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasiteB is a divalent or monovalent cation;M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80;a is 1 or 2;b is 3 when a is 1 or b is 4 when a is 2;and x is a number defined by 0.ltoreq.x<0.7; and rein said perovskite-type metal oxide compound having a B-site, and containing Mn on said B-site. [31.] A method for preparing a perovskite-type catalyst consisting essential of a metal oxide composition having component elements represented by the general formula: EQU A.sub.a-x B.sub.x M0.sub.b reinA comprises a mixture of elements selected from the group consisting of yttrium and lanthanides of an atomic number of from 57 to 71;B is a divalent or a monovalent cation;M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80;a is 1 or 2;b is 3 when a is 1 or b is 4 when a is 2;and x is a number defined by 0.ltoreq.x<0.7; method comprising:forming a homogeneous mixture of a single phase mixed lanthanide salt and respective salts, or oxides of elements B and M, wherein said single phase mixed lanthanide salt is collected from bastnasite; andforming a perovskite-type metal oxide composition from said homogeneous mixture.