By Heramb Kamble
Tantalum, a rare, very hard transition metal, does not occur naturally in metallic form.
The estimated average abundance of tantalum in Earth's crust is about 2 parts per million (or 0.0002%)
Tantalum is a very hard and durable metal. With a mohs hardness of 6.5 it is harder than Gold (2.8 to 4.0) and will resist scratching more than any precious metal.
Tantalum like most metals will still scratch in wear, but can still be repolished when required.