👉 Plagioclase is a mineral that is composed of two different types of minerals, namely plagioclase and pyroxene. Plagioclase is primarily found in the rocks of the Earth's crust and is named after its chemical formula (MgO
SiO2). It is also known as "greenstone" because it appears green on X-ray diffraction analysis. Plagioclase is a very hard, brittle mineral with a hardness of 6-7 on the
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