ilmenne

Ilmenne is a term that has appeared in some historical and regional sources as a variant spelling of ilmenite, the common iron titanium oxide mineral. In modern mineralogy the standard name is ilmenite. Ilmenite has chemical formula FeTiO3 and occurs in a variety of igneous and metamorphic rocks. It is typically black to steel-gray with a metallic to adamantine luster and a Mohs hardness of about 5–6. The mineral crystallizes in the hexagonal system and often occurs with magnetite, hematite, rutile, and other oxides.

Ilmenite is the principal ore of titanium and is widely exploited to produce titanium metal and titanium dioxide (TiO2) used in pigments and coatings. Processing typically involves reduction with carbon or the use of chlorine-based methods to yield titanium metal, while TiO2 pigment is produced from the oxide.

Geologically, ilmenite forms through magmatic differentiation and often concentrates in beach and dune placer deposits as heavy mineral sands. It is found worldwide in countries with titanium-bearing sands and in various igneous rock formations.

Origin of the name: the mineral ilmenite is named after the Ilmen River in the Ural region of Russia; the variant spelling “ilmenne” appears in some older texts but is not part of current standard nomenclature. If you meant a different term or a specific locale, additional context would help clarify.