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American Mineralogist; June 1983; v. 68; no. 5-6; p. 494-505
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Lindsleyite (Ba) and mathiasite (K); two new chromium-titanates in the crichtonite series from the upper mantle

Stephen E. Haggerty, J. R. Smyth, A. J. Erlank, R. S. Rickard, and R. V. Danchin

Univ. Mass., Dep. Geol., Amherst, MA, United States

Two new opaque minerals from metasomatized peridotites and kimberlites in the Republic of South Africa. Ba and K members of the AM 21 O 38 series, characterized by predominant A-specific large cations and M-formula small cations. Electron microbeam analyses give the following formulae: lindsleyite: A = Ba (sub 0.62) Sr (sub 0.41) Ca (sub 0.09) Pb (sub 0.01) K (sub 0.07) Na (sub 0.06) REE (sub 0.03) , M = Ti (sub 11.63) Zr (sub 0.87) Al (sub 0.11) Cr (sub 3.89) Fe (sub 2.87) Mg (sub 1.49) Nb (sub 0.08) ; mathiasite: A = K (sub 0.66) Ca (sub 0.22) Sr (sub 0.15) Ba (sub 0.10) Na (sub 0.05) REE (sub 0.05) , M = Ti (sub 13.18) Zr (sub 0.62) Cr (sub 2.87) Fe (sub 2.28) Mg (sub 1.63) Ca (sub 0.22) Nb (sub 0.09) . Space group is R3. Hexagonal unit cell parameters for lindsleyite are a = 1.037 nm, c = 2.052 nm, V = 1.911 nm 3 , and for mathiasite are a = 1.035 nm, c = 2.058 nm, V = 1.909 nm 3 . Calculated densities for the Ba and K members are 4.63 and 4.60 gm/cm 3 . Both minerals are black and have a metallic luster and conchoidal fracture. The minerals are pale tan in reflected light, exhibit weak reflection pleochroism and weak-moderate reflection anisotropy. Spectral reflectances for lindsleyite and mathiasite are very similar and are comparable to ilmenite and rutile.--Modified journal abstract.

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