KaRWQ Posted April 14 Share Posted April 14 Link to comment Share on other sites More sharing options...
Geologyhound Posted April 16 Share Posted April 16 Unfortunately, your fingers are in great focus in the first picture but not the rock. Is this rock one of the two the second picture? Are the two rocks in the second picture fairly light and relatively soft? If you have a piece of unglazed porcelain, do a “streak test” by scraping them on the porcelain. If it leaves in a black line, I would say it’s probably coal. If they are harder, or leave a different streak color, then there are a number of options. Link to comment Share on other sites More sharing options...
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