钙柱石

钙柱石（英语：Meionite）是属于方晶系的网状硅酸盐，分子式为Ca₄Al₆Si₆O₂₄CO₃^[1]。偶含硫酸盐物。是方柱石固溶终端矿物之一。是它于 1801 年在意大利维苏威火山的索玛山上首次被发现。由 Rene Just Haüy 以 μειωυ 命名的（希腊语中的“更少”之意），指的是与维苏威石（Vesuvianite）相比，金字塔形状不那么尖锐。

在方柱石固溶中，钙柱石具有最大的晶胞尺寸^[2]，并且在高压下具有非常高的热稳定性。这证明钙柱石是地壳深部基性或中性岩浆的主要矿物之一。钙柱石在高压下也会分解成钙铝石 + 蓝晶石 + 石英 + 方解石，与钙长石的压力上限类似。指明在地壳中的形成的矿物^[3]。

参考文献

^ Teertstra, David K.; Sherriff, Barbara L. (1997-04-25). "Substitutional mechanisms, compositional trends and the end-member formulae of scapolite". Chemical Geology. 136 (3): 233–260. Bibcode:1997ChGeo.136..233T. doi:10.1016/S0009-2541(96)00146-5. ISSN 0009-2541.
^ HANS P. EUGSTERHAROLD J. PROSTKAAND DANIEL E. APPLEMAN(1962) Unit-Cell Dimensions of Natural and Synthetic Scapolites.SCIENCE, Vol 137, Issue 3533, pp. 853-854 DOI: 10.1126/science.137.3533.853
^ Newton, R.C., Goldsmith, J.R. Stability of the scapolite meionite (3CaAl2Si2O2 • CaCO3) at high pressures and storage of CO2 in the deep crust. Contrib. Mineral. Petrol. 49, 49–62 (1975). https://doi.org/10.1007/BF00371078

[”Teertstra”-1] Teertstra, David K.; Sherriff, Barbara L. (1997-04-25). "Substitutional mechanisms, compositional trends and the end-member formulae of scapolite". Chemical Geology. 136 (3): 233–260. Bibcode:1997ChGeo.136..233T. doi:10.1016/S0009-2541(96)00146-5. ISSN 0009-2541.

[”HANS”-2] HANS P. EUGSTERHAROLD J. PROSTKAAND DANIEL E. APPLEMAN(1962) Unit-Cell Dimensions of Natural and Synthetic Scapolites.SCIENCE, Vol 137, Issue 3533, pp. 853-854 DOI: 10.1126/science.137.3533.853

[”Newton”-3] Newton, R.C., Goldsmith, J.R. Stability of the scapolite meionite (3CaAl2Si2O2 • CaCO3) at high pressures and storage of CO2 in the deep crust. Contrib. Mineral. Petrol. 49, 49–62 (1975). https://doi.org/10.1007/BF00371078

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