Vnaz50 Posted April 18, 2021 Share Posted April 18, 2021 San Antonio, Tx Below is another rock from my yard. After I cleaned this rock off and took a picture of it, I noticed the white areas on it appeared blue. At first I thought maybe it was the fluoride in the water. I waited a couple of days then put it under a black light and it was the same result. The last picture that actually show the white was when no light was directly hitting it. What would cause this? Link to comment Share on other sites More sharing options...
Myrmica Posted April 18, 2021 Share Posted April 18, 2021 Seeing where you live, it is highly likely that this is a piece of limestone with some secondary calcium carbonate forming the white coating (like caliche). Many minerals fluoresce in ultraviolet light, including caliche-like coatings in some areas. 1 Link to comment Share on other sites More sharing options...
Vnaz50 Posted April 18, 2021 Author Share Posted April 18, 2021 Thank you Link to comment Share on other sites More sharing options...
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