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Squawcreekite-rutile solid solution from the Kajlidongri Mine (India)

¹ Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova, Corso Europa 26, I-16132 Genova, Italy
² Department of Applied Geology, University of Saugar, P.O. Saugar-3 (M.P.), India

^* Corresponding author, e-mail: cabella{at}dipteris.unige.it

Squawcreekite is a rare AO₂ oxide with rutile-type structure. A squawcreekite (FeSbO₄)-rutile (TiO₂) solid solution has been recognised in quartz veins from the Kajlidongri manganese mine District Jhabua, Madhya Pradesh (India): this finding represents the first occurrence of a chemically pure squawcreekite-rutile solid solution. Transmission electron microscopy analyses exclude the existence of intergrowths or microinclusions, as well as spinodal decomposition. Quantitative electron microprobe analyses clearly indicate that the exchange vector Fe³⁺Sb⁵⁺Ti⁴⁺-2 accounts for the wide compositional variation suggesting the existence of a solubility range in natural samples between rutile₇₀squawcreekite₃₀ — rutile₃₀squawcreekite₇₀.

Key-words: squawcreekite, rutile, solid solution, mineral data, TEM, India..