What is Orthoclase?
Orthoclase Feldspar Rock Forming Mineral
Orthoclase is an abundant rock forming mineral that can be found in most types of granite. It occurs mostly as white or pink coloured crystals. The pink crystals present in granite are orthoclase.
Amazonite, labradorite, sunstone and moonstone are all feldspar minerals. Moonstone is made up primarily of orthoclase.
Orthoclase has been identified in igneous rocks brought back from the Moon and also in those identified on Mars.
The orthoclase in our photo is from Nevada. The photo which is clickable redirects to the original non-compressed image. Courtesy of Stan Celestian.