Ktenasite on Calcite from Kansas

Size: 3.8 x 6.6 x 3.0cm

Weight: 60g

Here's something we've never seen before, or heard of before: Ktenasite. The tourquoise-blue coating on this calcite crystal is Ktenasite, and the darker material is some shiny chalcopyrite and darker sphalerite. It's a very eye-catching and unusual specimen which is quite old. It comes with a very old Harry Sering label that is probably from the 1970's. The label also is interesting because it mis-identifies some of the minerals here and refers to the blue coating as Melanterite and says there is micro-selenite on the calcite as well, but it's probably all just Ktenasite. 

This specimen comes with a custom display base.