Smithite (Ag 2 S.As 2 S 3 ), proustite and xanthoconite (3Ag 2 A.As 2 S 3 ), wire silver, and argentite were prepared in concentrated alkali sulphide solutions at temperatures below 500 degrees C. and pressures below 900 atmospheres. The solutions were found to be chemically compatible with the gangue minerals found in epithermal silver veins. Therefore, the principal carriers for primary ruby silver ores are thought to be alkali sulphide solutions. The experimental results may explain some features of primary silver ores.

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