Any ideas what this is, not local?
M Mike52 New User Mike Mar 15, 2024 #1 Any ideas what this is, not local? Attachments 20240315_115536.jpg 2.6 MB · Views: 73 20240315_115532.jpg 1.9 MB · Views: 72
B bob vaughan Bob Vaughan Senior User Mar 15, 2024 #2 Being diffuse pourous eliminates a lot of candidates, but beyond that, its anybody's guess.