Before revision: topaz-rich granite contains: topaz – hardness 8, quartz – hardness 7, orthoclase feldspar – hardness 6, plagioclase feldspar – hardness 6 to 6.5, mica – hardness 2 to 4).
After revision: topaz-rich granite contains: topaz – Mohs 8, quartz – Mohs 7, orthoclase feldspar – Mohs 6, plagioclase feldspar – Mohs 6 to 6.5, mica – Mohs 2 to 4).