The historical development of titanium

From the discovery of titanium element to prepare pure, lasted for more than a hundred years. While the titanium has actually been spent, recognize the true face of the original, is in twentieth Century, after 40 years of things.
The surface of the earth ten kilometers thick stratum, titanium containing up to 6/1000, 61 times more than copper, the content in the crust (crust in the tenth row elements ranking: oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium and hydrogen, Titanium Flange Screw), literally from the ground up a handful of dirt, which contains a few thousandths of titanium, the world's reserves of more than ten million tons of titanium ore is not rare.
There are a million tons of sand on earth, titanium and zirconium these two than sandstone heavy mineral, is mixed in the sand, after the sea millions of years around the clock to washing, compare heavy ilmenite and zircon placer rushed together, in the long coastline, the formation of a piece of titanium ore layer and zirconium ore. The seam is a black sand, there are usually a few centimeters to tens of CM thick. Titanium tube fittings is not magnetic, titanium built nuclear submarines do not have to worry about magnetic mine attack.