To be completely anal, Kelly, black is a color not a texture. In our caves, goethite coats rocks.
Here is the first, random picture of goethite that I came across from the CDF Gallery. Note that everywhere a person has pulled and glided (or banged a tank), the goethite is scraped off and the lighter, tan limestone beneath is exposed. Sometimes there's no way to navigate a passage and NOT mess up the goethite, at least a little. But cheers to Kelly for trying to preserve our caves in their natural state.
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