Triassic Cycad Replaced by Copper Minerals, Nacimiento Mine, Cuba, NM

Description

Triassic Cycad Replaced by Copper Minerals, Lost Lake Claim, Nacimiento Mine, Cuba, New Mexico.  I owned this claim until July, 2020 and still have a lot of inventory.  The wood is mostly replaced by chalcocite (CU2S) which is 90% copper by weight.
The arkose sandstone in which the wood in encased is usually stained with malachite and, at times, azurite.   The black mineral is tenorite.  It appears to be coal, but is not -- if you heat it with a butane torch, it does not burn and turns a copper color.
This is a solid piece of chalcocite with some malachite stain and some tenorite.   It nicely shows the structure of the wood.  I cut an end off and buffed it with a brass wire wheel to demonstrate the metallic shine of the chalcocite.  2 1/2 inches.   3/4 of a pound.  wood7
I will combine shipping when specimen safety can be guaranteed which is much of the time.