Apropos of nothing, the entry right before "gamut" in the OED is "gamisgraditeMin. A velvet-black variety of amphibole." (And if you don't recognise the word "amphibole", perhaps you know it under its alias "hornblende".)
Hornblende are those black specks you see in granite (and other igneous rocks). If you look closely, you can see that they are often columnar in shape.
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Apropos of nothing, the entry right before "gamut" in the OED is "gamisgradite Min. A velvet-black variety of amphibole." (And if you don't recognise the word "amphibole", perhaps you know it under its alias "hornblende".)
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hornblende
Chuck, your geology lesson for today.