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 ha
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.