Wonderful material from a specimen mined in the late 1800s to early 1900s.
Gummite has been tested and contains rare minerals Compreignacite,  Becquerelite and Schoepite. Nice high grade Uraninite from the Type Locality.
4.8x3.8x2.9 cm
61.3 grams
550,000 cpm on Radiacode 110
Joachimsthal (Jachymov), CZ 
Type Locality for Uraninite.
R7