I found this in my backyard and would love to know what I'm looking at. It reminds me of a fossil. I live in Colorado, Denver-metro. The sample is about 2 inches top to bottom, weighs maybe .5 lb, dull luster, can scratch with penny. Filled with little crevices, holes that remind me of fossils. Spiderwebbed areas also. A few quartz-like minerals embedded, also areas of teeny crystals. The pinkish color in photo is true.

From Colorado. Denver area.


closed as off-topic by Jan Doggen, Friddy, Fred, arkaia, trond hansen Aug 31 at 4:55

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  • $\begingroup$ Drop some vinegar on it. Does it fizz? Can you scratch the quartz-like minerals with a knife? Can you scratch them with your fingernails? $\endgroup$ – Gimelist May 14 '18 at 22:54
  • $\begingroup$ It does fizz. I can scratch quartz-like mineral with a knife, but it not from fingernail... or at least I can't notice a scratch from fingernail. $\endgroup$ – Marc Krulewitch May 15 '18 at 17:55
  • $\begingroup$ And it tastes salty. $\endgroup$ – Marc Krulewitch May 16 '18 at 18:55