In the Hindu religious tradition, the tulsi, or holy basil, plant serves both as an important symbol and also as a popular medicinal remedy.
Diamond use to be the hardest known natural substance now it is the mineral lonsdaleite at 58% stronger then diamond is the first the second hardest is wurtzite boron nitridâ¦e at 18% stronger then diamonds they are both extreamly rare natural minerals sources http://www.newscientist.com/article/dn16610-diamond-no-longer-natures- ...
Lead is one of the few natural substances that has no known use in the human body. At even very low levels, lead has been shown to cause health problems. The difficulty with lead is that once it is mined from the earth, there is no known way to destroy or make it harmless.