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Kimberlite

Sedimentary rock chiefly comprised of ultramafic constituents, a variety of peridotite and it is the principal ore of diamonds. Named after Kimberly, South Africa

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Kilogram

A standard unit of mass initially calibrated to the weight of 1 liter of water. Abbreviated as “Kg”, it is equal to 1000 grams, and 1000 kilograms is equal to the weight of 1 ton

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Kiln

A refractory furnace used for processing minerals at high heat

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Kettle

A kettle shaped depression formed by glacial melt

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Kernel

An atom without the valence electrons of its outer shell

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Karat

One twenty-fourth of a whole, increments of purity applied to gold with the difference being other alloying metals. 10 karat gold represents 10 parts gold out of 24 parts, therefore being 40% pure

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K-feldspar

An endmemember of the feldspar group along with albite and anorthite,  KAlSi3O8  which includes microcline, orthoclase and sanidine

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K-T extinction

The K-T or Cretaceous–Tertiary extinction was the mass extinction of animals, plants and organisms, occurring 65 million years ago, at the boundary of Cretaceous and Tertiary periods in time