Forged Destiny [Book 1: Ch. 6]

""I'd like to buy this," I dumped the rock down on the man's counter, watching as he inspected me and then the ore itself, lifting it up and humming lightly.

"Good choice," he said after a moment, no doubt doing as I had and using his Skills to inspect the mineral content. It was a Blacksmith-specific Skill, something any Blacksmith learned early in their life and more of a passive ability than an active one. It didn't tell you much, just what was used and in what quantities. It was useful for forging, however, especially in making sure you didn't include too much or too little material."

—Forged Destiny [Book 1: Ch. 6]