Structural Studies of Hydrogarnet and Vesuvianite

本项目涉及水榴石和相关矿物维苏威岩的几种成分的晶体结构分析。利用单晶中子衍射法对天然钛安德雷岩和维苏岩进行研究，以确定H原子的位置和环境。维苏威岩与许多水榴石共生，在某些情况下，表现出与水榴石非常相似的红外光谱。分析这种类石榴石矿物的结构可以为氢取代的性质提供额外的信息。这些研究的结果将提供对控制天然水榴石“稳定性”的晶体化学因素的见解，这种矿物存在于许多重要的岩石类型中。

This project involves the crystal-structural analysis of several compositions of hydrogarnet and the related mineral vesuvianite. Single-crystal neutron-diffraction studies of natural Ti-andradite and vesuvianite will be carried out to determine the position and environment of the H atom. Vesuvianite is intergrown with many hydrogarnets and, in some cases, exhibits an infrared spectrum very similar to hydrogarnet. Analysis of the structure of this garnet-like mineral may provide additional information on the nature of the H substitution in hydrogarnet. The results of these studies will provide insights into the crystal-chemical factors which govern the "stability" of natural hydrogarnets, minerals which occur in a number of important rock types.