Ontario Mineral - Lyndochite
Description:

 (Th - Ca Euxenite). Occurs as stout, prismatic crystals; conchoidal fracture, dull on external faces, but brilliant black on fresh surfaces; associated with magnetite; often radioactive.
(no longer a recognized species)

 
Color:

 Black
Hardness:

 5.5 - 6.5
Occurance:

 Beryl Pit