Most plagioclaste ones exhibit albite twinning while all are triclinic, while alkali ones can be found in acidic igneous rocks such as granites. Solid solution plays a significant part in the rock mak
Most plagioclaste ones exhibit albite twinning while all are triclinic, while alkali ones can be found in acidic igneous rocks such as granites. Solid solution plays a significant part in the rock making ones, known as aluminosilicates, and members exhibit two cleavages at a 90 degree angle. One member is commercially sold as soda spar, and those that show opalescence are sold as moonstones. Including labradorite and orthoclase, FTP, identify this group of minerals, number 6 on Mohs' scale of hardness.
Most plagioclaste ones exhibit albite twinning while all are triclinic, while alkali ones can be found in acidic igneous rocks such as granites.