- 著者
-
朽津 信明
- 出版者
- Japan Association of Mineralogical Sciences
- 雑誌
- 岩鉱 (ISSN:09149783)
- 巻号頁・発行日
- vol.87, no.9, pp.388-391, 1992
- 被引用文献数
-
7
2
Evaporites were observed on a surface of the historical brick in the Museum Meiji-Mura. Aphthitalite (K<sub>3</sub>Na(SO<sub>4</sub>)<sub>2</sub>), thenardite (Na<sub>2</sub>SO<sub>4</sub>), trona (Na<sub>3</sub>H (CO<sub>3</sub>)2•2H<sub>2</sub>O), and thermonatrite (Na<sub>2</sub>CO3•H<sub>2</sub>O) were identified as the main component minerals of the evaporites. These evaporates are considered to be formed in these less than a few decades under the humid climate of Japan. Because no sulfur-containing minerals can be found in the plaster nor in the bricks, it is thought that aphthitalite and thenardite were formed by the interaction between bricks and acid rain water with SO<sub>4</sub><sup>2-</sup>ion. Experimental results support this idea; rain water-brick interaction has produced sulfate, whereas distilled water-brick interaction has not produced sulfate. To conserve this brick cultural property, it is desirable that roofs and gutters would be improved to prevent bricks from impregnation of rain water.