Ilmeniteapatite

Ilmeniteapatite is not a formally recognized mineral name in standard mineralogical references. The combined term does not denote a distinct mineral with a fixed chemical formula, and it is not an IMA-approved species. In some scientific writings, the phrase may be used informally to describe an association or texture in which ilmenite and apatite occur together, or to refer to ore deposits where these two minerals are the principal phases. Because it is not an established mineral designation, its meaning can vary by source and context.

Overview of the constituent minerals helps clarify the term. Ilmenite is an iron titanium oxide with the approximate formula FeTiO3 and is common in mafic and ultramafic igneous rocks as well as in metamorphic rocks and certain sands. Apatite is a calcium phosphate mineral with a general formula similar to Ca5(PO4)3(F,Cl,OH) and is widespread in igneous, metamorphic, and sedimentary contexts; it is also an important phosphate ore.

If used, the ilmenite-apatite concept often arises in discussions of ore deposits or rock associations where ilmenite and apatite occur together, such as in carbonatites or alkaline igneous systems. In mining and economic geology, some deposits are described as ilmenite-apatite ore because these two minerals are the principal economic constituents, rather than indicating a new mineral species.

See also: Apatite, Ilmenite, Carbonatite, Phosphate ore.