Pink to pink gemstone-high-quality corundum is termed ruby. Its chemical formula is Al2O3Cr. The chromium offers ruby its coloration. Ruby displays a trigonal crystal system along with a Mohs hardness of 9. /* Problem: C# Language Version: six.0 .Web Framework Model: four.seven Resource Model : Visible Studio Community 2017 Feelings https://oswaldv987fth1.blogdeazar.com/profile