(February 2014) Allusion is a figure of speech, in which one refers covertly or indirectly to an object or circumstance from an external context. It is left to the audience to make the connection; where the connection is directly and explicitly stated (as opposed to indirectly implied) by the author, it is instead usually termed a reference.
Titanium metal connects well with bone, so it has found surgical applications such as in joint replacements (especially hip joints) and tooth implants. The largest use of titanium is in the form of titanium(IV) oxide. It is extensively used as a pigment in house paint, artistsâ paint, plastics, enamels and paper.
Titanium occurs in rocks in the form of oxide and silicate minerals. Of greatest economic value are titanium-bearing oxide minerals such as ilmenite, rutile, anatase, brookite, perovskite and magnetite. Rutile (titanium dioxide) and ilmenite (35% - 65% titanium dioxide) are the two primary sources of titanium products, with ilmenite the most abundant (Force, E.R, 1991). Ilmenite ore is sourced through the mining of magmatic and heavy mineral sand (also referred to as placer) deposits.