. Bulletin of the British Museum (Natural History), Mineralogy. 246 PETROLOGY OF LORD HOWE ISLAND, PART I. degrees Fig. 10. Range in optic axial angles in pyroxene phenocrysts in (a) The Gower-Lidgbird lava series and (b) The dyke rocks. is one of impoverishment of calcium as well as of enrichment in iron (LeMaitre, op. cit.). The slight deviations, in the same sense, between the Ca : Mg : Fe ratios deter- mined by chemical analysis on the one hand and by X-ray analysis on the other may be due to the relatively large amount of aluminium in these pyroxenes, and especially to the Al in 6-fold co
. Bulletin of the British Museum (Natural History), Mineralogy. 246 PETROLOGY OF LORD HOWE ISLAND, PART I. degrees Fig. 10. Range in optic axial angles in pyroxene phenocrysts in (a) The Gower-Lidgbird lava series and (b) The dyke rocks. is one of impoverishment of calcium as well as of enrichment in iron (LeMaitre, op. cit.). The slight deviations, in the same sense, between the Ca : Mg : Fe ratios deter- mined by chemical analysis on the one hand and by X-ray analysis on the other may be due to the relatively large amount of aluminium in these pyroxenes, and especially to the Al in 6-fold co-ordination. Although the Al allotted on the formal. 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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