With thieves, I consort,
With the vilest, in short,
I’m quite at ease in depravity;
Yet all divines use me,
And savants can’t lose me,
For I am the center of gravity.
Who am I?
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' and my last three letters are a metal. Who am I?