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Many different mineral commodities are important to modern society. However, when mineralogists think about mining, they are generally thinking of ore minerals that are the sources of important metals, or of minerals that have specific, highly valued properties (e.g., asbestos, micas, potash, and gems of all sorts).That is what we will focus on in most of …Gossan - The rust-colored capping or staining of a mineral deposit, generally formed by the oxidation or alteration of iron sulphides. Gouge - Fine, putty-like material composed of ground-up rock found along a fault. Grab sample - A sample from a rock outcrop that is assayed to determine if valuable elements are contained in the rock. A grab ...