For 10 points, name these tectosilicate minerals that make up 60% of the Earth's crust, the most abundant mineral ahead of quartz.
Anders Celsius lends his name to a barium-containing member of these minerals. A sodium-rich example of these minerals is albite, and a calcium-rich one is anorthite. Two of these minerals are used to name the QAPF diagram, and these minerals all have exactly eight (*) oxygen atoms. One subclass of these minerals makes up the continuous branch of Bowen's reaction series, and another subclass defines 6 on the Mohs hardness scale. These minerals have orthoclase and plagioclase varieties. For 10 points, name these tectosilicate minerals that make up 60% of the Earth's crust, the most abundant mineral ahead of quartz.
Anders Celsius lends his name to a barium-containing member of these minerals.
feldspars (accept plagioclase feldspar or orthoclase feldspar or alkali feldspar; anti-prompt [ask for less specific] if they just say plagioclase or orthoclase or alkali)