Sphalerite on Pyrite sulfasalt I have never seen anything

I have never seen anything quite like this from any mine in Bolivia

Specimen # BOL711B262

Finding a fine quality "cogwheel" such as this on matrix from Machacamarca is not common

let alone a twinned crystal on matrix is exceedingly rare

Sphalerite on Pyrite sulfasalt I have never seen anythingA beautiful pair of matched complex, highly modified, deep reddish black groups of Sphalerite are smartly perched atop a mound of HIGHLY lustrous, bright, metallic, golden striated Pyrite pyritohedra. No real damage to speak of on the display side, and very attractive for a smaller Gilman specimen. A beautiful toenail sized display specimen from the world famous Eagle Mine (more properly the New Jersey Zinc Eagle Mine). This mine is long defunct and