Cuprite, Bornite, Chrysocolla, Malachite
Plainville Trap Rock Quarry, Plainville, Hartford County, Connecticut, USA
Hunk of copper minerals from a fault-hosted hydrothermal vein that cut through the basalt and underlying sandstones. Most of the mass is bornite (blue-purple iridescence), with alteration to reddish earthy cuprite, blue-green chrysocolla and green malachite. Much of the basalt is altered to what appears to be talc, much of it with a strange ...
© 2020 Harold Moritz