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7 August 2011

Geology Word of the Week: J is for Jimthompsonite

def. Jimthompsonite: 1. A magnesium and iron-rich silicate mineral found between the chlorite and actinolite zones of a metamorphosed ultramafic body. Jimthompsonite has the formula (Mg,Fe)5Si6O16(OH)2 and an orthorhombic structure. The mineral was named after James Burleigh Thompson, Jr., an eminent mineralogist and petrologist. 2. A wonderful example of scientists having fun with naming– and, in the process, classifying and better understanding– the world around them. Jimthompsonite is a delightfully …

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