. Bulletin of the British Museum (Natural History), Mineralogy. 86 ANORTHOCLASE FROM NIGERIA Chemical composition The chemical analysis of a hand-picked sample of the feldspar of the phenocrysts is given in Table i, together with the atomic ratios and unit cell contents, calculated KAISlO,. NaAISijOg 90 Co AljSijOg • Nigerian Anorthoclase • Other Anorthoclases " Oligoclase c Albite " Orthoclase * Orthoclase & Microcline o Unclassed The names are those given by the authors of the various analyses. Fig. I. on a basis of 32 oxygen atoms. The analysis shows that the feldspar falls we
. Bulletin of the British Museum (Natural History), Mineralogy. 86 ANORTHOCLASE FROM NIGERIA Chemical composition The chemical analysis of a hand-picked sample of the feldspar of the phenocrysts is given in Table i, together with the atomic ratios and unit cell contents, calculated KAISlO,. NaAISijOg 90 Co AljSijOg • Nigerian Anorthoclase • Other Anorthoclases " Oligoclase c Albite " Orthoclase * Orthoclase & Microcline o Unclassed The names are those given by the authors of the various analyses. Fig. I. on a basis of 32 oxygen atoms. The analysis shows that the feldspar falls well within the anorthoclase field having the composition It contains 0-2 per cent, of the celsian molecule. In Fig. i the composition is shown in the form of a triangular diagram, in which plots of analyses of similar feldspars have been Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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