Then the sixth angel emptied his bowl upon the great river Euphrates; and the water in the river was dried up, so that the road for the Kings of the East might be made ready.

Then the sixth angel blew; and I heard a voice proceeding from the corners of the golden altar that stood before God.

It spoke to the sixth angel--the angel with the trumpet--and said 'Let loose the four angels that are in chains at the great river Euphrates.'

the fifth a sardonyx; the sixth a carnelian; the seventh a chrysolite; the eighth a beryl; the ninth a topaz; the tenth a chrysoprase; the eleventh a hyacinth; and the twelfth an amethyst.

And I saw the Lamb break the sixth seal, and then there was a great earthquake. The sun became black, like sackcloth, and the moon, which was at its full, like blood.