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Phylum Ectoprocta, Order Cheilostomata: Microprobe Analysis of Calcium, Magnesium, Strontium, and Phosphorus in Skeletons
Thomas J. M. Schopf and J. R. Allan
New Series, Vol. 169, No. 3942 (Jul. 17, 1970), pp. 280-282
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1729534
Page Count: 3
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Calcium, magnesium, and strontium occur in approximately constant ratios in traverses through skeletal walls of a single mineralogy (either calcite or aragonite). Skeletal walls of more than one mineralogy have the magnesium-rich layer (calcite) surrounding the living chamber and the strontium-rich layer (aragonite) on the outside. In contrast, phosphorus may be present in greater or lesser amounts in different parts of the same calcite skeletal wall. Aragonitic crystallites appear oriented roughly perpendicular to skeletal walls, whereas calcitic crystallites are parallel to skeletal walls.
Science © 1970 American Association for the Advancement of Science