A true rarity! Fibrous Navrotskyite with black crystals of voltaite.  The mudstone is a quartz rich siltstone.  This comes from the only known locality in the world for Navrotskyite. Great UV reaction. You reallt have to love a mineral when there is only a single place in the world known for its occurence! This piece glows fiercely on both sides and looks great under intense magnificaction. This is one of the nicer medium sized pieces that I have of this material. Analyzed by my favorite Rock Doctor.
6.2x2.5x1 cm
19.2 grams
Blue Lizard Mine, Utah
Slightly elevated reading
S4