Characteristics of k ar dating

As a result of its unreactiveness, argon is used in light bulbs to protect the filament and to provide an unreactive atmosphere in the vicinity of welding.It is also used in the semi-conductor industry to provide an inert atmosphere for silicon and germanium crystal growth.After isolating the new gas, the first of the noble gases to be discovered, the scientists named it argon ("the inactive one") and found it made up almost one percent of air. A large hall may easily contain a greater weight of it than a man can carry." Argon is a noble gas.It is colorless, odorless and extremely unreactive.

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Alkali feldspar has the formula KAl Si, potassium aluminosilicate.But a deep green variety of microcline called amazonite stands out in a pretty homogeneous field. The high potassium content and high strength of K-feldspar make it the best mineral for potassium-argon dating.Alkali feldspar is a crucial ingredient in glass and pottery glazes. Plagioclase ranges in composition from Na[Al Si The geologist distinguishes these under the microscope.Potassium feldspar comes in three different crystal structures that depend on the temperature it formed at. Orthoclase and sanidine are stable above 500° C and 900° C, respectively.Outside the geological community, only dedicated mineral collectors can tell these apart.

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