Those classified as plagioclase are triclinic and include andesine and anorthite, while barium onesare monoclinic and include celsian and hyalophane. Another classification, alkali, applies to those suchas orthoclase and microcline that fall between the (*) potassium variety and albite. These rocks have aname from the German for field rock or rock without ore, and their crystals can sometimes be found ingranite. For 10 points, the orthoclase type of what group of minerals, the most abundant group found in theearth’s crust, has a Mohs hardness of six?The post geology first appeared on Blackboard Masters.
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