Task: Text Categorization
Input (English): One type of them is often twinned according to the Baveno and Carlsbad laws, and two types of them are the namesakes of the QAPF diagram. Celsian is one type composed of barium, and another type has cleavage planes that form slightly oblique angles; triclinic members of that type include albite, anorthite, and labradorite. One type of this mineral has a value of six on the Mohs hardness scale, and another type is located on the continuous branch of Bowen's reaction series. Approximately sixty percent of the Earth's outer crust is composed of this group of minerals, whose members are silicates of aluminum. FTP name this rock-forming group of minerals whose types include orthoclase and plagioclase.
Output (English): Science