(1) The fossiliferous horizons occur in greenish to greyish siltstones and brown to black fissile shales associated with mollusc shells.

(2) For example, fissile slates tend to yield much flatter particles than massive granites.

(3) Smuggling can potentially provide fissile material for nuclear weapons or a wider range of radioactive materials for use in u251cu00f6u251cu00e7u251cu2510dirty bombsu251cu00f6u251cu00e7u251cu00fb.

(4) The oil shales are very fissile, non-laminated, dark brown to black and have a bituminous smell, whereas the less carbonaceous beds are weakly fissile .

(5) The shales are conspicuously fissile throughout the section and, along with the associated carbonates, tend to become increasingly red-colored toward the top of the member.

(6) No natural reactors exist today, as the relative density of fissile uranium has now decayed below that needed for a sustainable reaction.

(7) As a general rule, however, the biggest hurdle for a would-be nuclear power is the acquisition of fissile material - enriched uranium or plutonium.

(8) It resumed the production, and testing of uranium enrichment centrifuges that can make fissile material for nuclear reactors or weapons.

(9) It also is the toxic and radioactive byproduct of enriched uranium, the fissile material in nuclear weapons.

(10) This horizon, up to 1.3 m thick, is a black, highly fissile shale.

(11) During compaction of siliciclastic muds the flaky clay particles are realigned to be parallel to each other and impart a fissility (a direction of easy splitting) to the rock, which is commonly called shale.