This mineral's chemical formula is aluminum three oxide or Al2O3 and its hardness is rated at nine on the Mohs scale.
A form of this mineral was the first gemstone to be synthesized, a process completed by Gaudin in 1837. This mineral can be synthesized in the flame fusion Verneuil process and is the chief component of emery. This mineral's chemical formula is aluminum three oxide or Al2O3 and its hardness is rated at nine on the Mohs scale. Marked with traces of chromium, titanium, and iron, for 10 points, name this mineral with gemstone varieties like red ruby and blue sapphire, the second hardest naturally occurring substance, which unfortunately isn't as hard as diamond.
A form of this mineral was the first gemstone to be synthesized, a process completed by Gaudin in 1837.
{corundum}