Answer:
I was was before was was was.
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
The more you add the less it weighs. What is it?
What is easy to spot but hard to find?
I am the minerals vital for your good health.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?