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- ...
There is actually no scientifically accepted 'hardest' substance known to man and there are a lot of debates over this. It's a common misconception that diamond is the hardeâ¦st but variations of substances like Boron and minerals like Lonsdaleite are actually tougher than diamonds.