When lower dose ranges were found not to be hazardous, the lawsuits were alleviated and the bomb and other testing programs were closed. Medical researchers have found out that uranium hexafluoride could have rather severe effect on the central nervous system and that it was the fluoride component of the uranium hexafluoride that was the cause of such effects in the nervous system. Recent discoveries of the effect of fluoride on children have shown that there is a possibility that fluoride might cause lower IQ's in children. A single crystal can be multi-colored. Luster is vitreous.
Crystals are transparent to translucent.
Crystal Habits include the typical cube and octahedron, as well as a combination of these two and other rarer isometric habits. Fluorite usually has equant crystals, but less common habits include crusts and botryoidal forms. Twinning also produces penetration twins that look like two cubes grown together. Cleavage is perfect in 4 directions forming octahedrons. Fracture is irregular.