Why is titanium so rare?
Why is titanium so rare? As the ninth-most abundant element in the Earth's crust, titanium is relatively rare. Research shows the strong and lightweight metal only accounts for roughly 0.63% of the Earth's crust. With such little titanium available, it costs more to harvest and produce than other metals.
How much titanium is left?
Total reserves of anatase, ilmenite, and rutile are estimated to exceed 2 billion tonnes. The concentration of titanium is about 4 picomolar in the ocean. At 100 °C, the concentration of titanium in water is estimated to be less than 10-7 M at pH 7.