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- ...
Wayne Scherr/Getty Images. Materials Varying In Hardness. Everyone knows the hardest material on Earth is diamond, says George Pharr, director of the Joint Institute for Advanced Materials at the University of Tennessee. But when it comes to the softest stuff on the planet, there's no one definition, he says.