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Aug 28, 2019· The key difference between orthoclase and plagioclase is that orthoclase appears in greenyellow colour, whereas plagioclase appears in white colour.. Orthoclase and plagioclase are important these forms are members of the feldspar group. A feldspar mineral is an abundant rockforming mineral typically occurring as colourless or palecoloured crystals.
Plagioclase
Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as Kfeldspar.
Orthoclase feldspar may arise from regional metamorphic processes, and is a common ingredient in various crystalline schists (Table ). Orthoclase changes to kaolinite (Section ) and sericite with the process of kaolinization and sericitization, respectively.
Location: Home > Plant Materials In Orthoclase Feldspar. ... Orthoclase, or orthoclase feldspar is an important tectosilicate mineral whichforms igneous greatly differ. Orthoclase is one of the ten defining minerals ofthe Mohs scale of mineral hardness, on which it is listed as having a hardness of6.
Orthoclase is one of the most common minerals, and occurs in numerous mineral environments. It is polymorphous with the minerals Microcline and three minerals form the Potassium Feldspar are almost identical in physical properties, and it is sometimes impossible to distinguish one another without xray analysis.
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