Composition: Titanium oxide
Nomenclature: Named after the English mineralogist, Henry James Brucke.
Industrial Uses: Ore of titanium.
Additional Notes: Brookite is a polymorph with two other minerals, anatase and rutile. Polymorphs (a term that means "multiple forms") are minerals that have the same chemical composition--titanium oxide in the case of anatase, brookite, and rutile--but have different crystallographic structures.
Monaco : Scott 1727 : 4.00 franc : 4 Sep 1990
Brookite