Physics
Scientific paper
Apr 1955
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955gecoa...7..189r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 7, Issue 3-4, pp.189-202
Physics
13
Scientific paper
The Goldschmidt Rules dealing with the distribution of trace elements in magmatic minerals require modification to allow for the differing electronegativities of elements which display diadochy. If the trace element possesses a substantially higher electronegativity than the element which camouflages it, it will tend to form more covalent, and consequently weaker bonds in the crystal than its host. Such an element will not be accepted readily into the crystal and therefore becomes concentrated in residual magmas. If the electronegativity of the trace element is less than that of its host, the positions are reversed and it will be preferentially concentrated in crystals containing the host element. These relationships apply when the electronegativity difference between the host and the trace element is greater than 0.1 (approx.). When the difference is 0.1 or less, the original Goldschmidt Rules are usually valid.
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