Gedrite is a mineral that belongs to the amphibole group. It is named after the Scottish geologist Sir Archibald Geikie. Gedrite is a complex silicate mineral that is typically found in metamorphic rocks such as gneiss, schist, and amphibolite. The chemical formula of gedrite is Na2Mg5Fe3AlSi7O22(OH)2, which means it contains sodium (Na), magnesium (Mg), iron (Fe), aluminum (Al), silicon (Si), oxygen (O), and hydroxyl (OH) ions. It has a monoclinic crystal structure, with elongated prismatic crystals that can reach several centimeters in length. Gedrite is commonly used in geologic research to understand the conditions and processes of metamorphism. It can also be used as an indicator mineral for certain types of mineral deposits, such as skarns and porphyry copper deposits.
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