| 摘要 |
PURPOSE:To obtain the titled mineral having an improved purity and whiteness and also having a grown crystalline structure by incorporating a prescribed silicon component, a zinc component and an aluminum component in the prescribed ratio and performing a hydrothermal reaction of the obtd. mixture in the presence of a salt of a basic nitrogen contg. compd. and an acid. CONSTITUTION:The silicon component composed of a silica or a silicon compd. capable of forming the silica, and the zinc component composed of a zinc oxide and a zinc hydroxide or a zinc compd. capable of forming the zinc hydroxide, and the aluminum component composed of an alumina hydrate and an aluminum hydroxide or an aluminum compd. capable of forming the alumina hydrate or the aluminum hydroxide are prepared respectively. The prescribed three components are compounded in amounts of 5-45mol% SiO2, 35-65mol% ZnO and 0-60mol% Al2O3, and then, the hydrothermal reaction of the resulting composition is performed.
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