R4: Mineral sciences of the Earth surface

[R4P-03] Greenalite synthesis at low temperatures

*Hiromi Konishi¹, Waleed Anwar¹ (1. Department of Geology, Niigata University)

Keywords:greenalite, Si-magnetite, BIF

We attempted to synthesize greenalite at low temperatures between pH 8 and pH 13. Both greenalite and Si-magnetite formed at 150 degree between pH 9 and 13. Greenalite formed more at higher pH whereas Si-magnetite formed more at lower pH. At 50 degree both greenalite and Si-magnetite formed at pH 11. Greenalite formation needs very strongly alkaline conditions.