Quartz Cluster - unknown origin

This is a striking example of quartz  cluster formation.  It appears to share characteristics of Arkansas quartz, but that is just a guess.  Abounding with "tunnels" of crystals - some people call them "fairy caves" - this is truly a magical piece.  I tried to capture as many of its very cool features, so check out all of the photos.  1.536 lbs, 4" x 4"  x 3.5"