Join Date: Jul 2004
Location: Gadsden, Alabama
Correcting typosRun it by the Geology Dept. at Cal Poly Pomona, they can verify whether it is slate, but I d not remember any in that area (I used to work at Cal Poly). Could be shale, which is unmetamorphosed slate and not as safe. Just call and ask when would be a good time to drop by, most profs I know are very happy to spend a few minutes helping.
Besides the vinegar test, try the lighter test - if a cigarette lighter flame applied to the rock produces a burnt smell, the rock has organics in it. Remember, that is petroleum country!
If you are unable to take it to Cal Poly. mail me a chip and I will examine it - I'm a geologist (retired).
Last edited by mosasaur; 11-12-2009 at 11:14 PM.
Reason: Correcting typos