Agreed about color gamut film/sensor limitations in nature of course and that goes beyond rock. A important task for photographers is to find light for difficult subjects that can render within the range of film/sensors. And as you noted as someone well acquainted with minerals and geology that is not always possible particularly with close-ups. However film and image sensors given good lighting can display the vast majority of non-contrasty landscape colors with reasonable fidelity those judging color would be satisfied with.
And I'm glad you have that attitude about special places. Much the same as attitudes of tight-lipped fishermen for backcountry lakes with lunker fish. My website displays many fantastic places a lot of people would like to know where they were taken. But my audience will have to be content reading vague regional references. Otherwise..."Put your boots on, get outside making an effort exploring, then you too might just happen upon special places."
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