鈣柱石

鈣柱石（英語：Meionite）是屬於方晶系的網狀矽酸鹽，分子式為Ca₄Al₆Si₆O₂₄CO₃^[1]。偶含硫酸鹽物。是方柱石固溶終端礦物之一。是它於 1801 年在義大利維蘇威火山的索瑪山上首次被發現。由 Rene Just Haüy 以 μειωυ 命名的（希臘語中的「更少」之意），指的是與維蘇威石（Vesuvianite）相比，金字塔形狀不那麼尖銳。

在方柱石固溶中，鈣柱石具有最大的晶胞尺寸^[2]，並且在高壓下具有非常高的熱穩定性。這證明鈣柱石是地殼深部基性或中性岩漿的主要礦物之一。鈣柱石在高壓下也會分解成鈣鋁石 + 藍晶石 + 石英 + 方解石，與鈣長石的壓力上限類似。指明在地殼中的形成的礦物^[3]。

參考文獻

^ 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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