Chalcocite Replacing Wood
John Betts - Fine Minerals
Bluish-gray Chalcocite replacing organic wood in coarse sandstone. Wood was buried during erosion and compacted into sandstone, then Chalcocite leached through the sandstone and precipitated in the voids created by the decomposed wood. Ex Jeff Weissman collection #362; ex. Tom Massis, co-author of The Mex-Tex Mine, Bingham, New Mexico in Mineralogical Record v.30#5
Nacimiento Copper Mine, near Cuba, Sandoval County, New Mexico
7.5 x 5.5 x 3.0 cm.