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228<br />

TableS.2<br />

Definitioru of Niggli Number:!<br />

From Tomkcicff (19S3): NiggJi values· The weight percen~ge5 of the chemical analysis<br />

of an igneous rock: are divided by the molecular wtight of the rcrresponding oxide,<br />

producing the molecular numbers. These arc lIlen regrouped, added and recalculated to<br />

100 to produce lIIe NiggJi values si, ai, fm, alk, mg and k.<br />

,,-<br />

mol cont. SilO,lmoJ(AIIOl+CaO+FeO+Fe,OJ+MnO+MgO+N~O+K10)<br />

alk= (NajO+KjO)!<br />

mg= MgOfmoJ(MgO+FeO+2Fcj O, +MnO)<br />

Ie-<br />

K:O/mol(KjO+Nap)<br />

NOIe: after Van de Kamp and Leake (1985)

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