Abstract
Squawcreekite is a rare A O 2 oxide with rutile-type structure. A squawcreekite (FeSbO 4 )-rutile (TiO 2 ) 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 Fe 3+ Sb 5+ Ti 4+ -2 accounts for the wide compositional variation suggesting the existence of a solubility range in natural samples between rutile 70 squawcreekite 30 — rutile 30 squawcreekite 70 .
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