Charles Ellicott Commentary Daniel 10:6

"his body also was like the beryl, and his face as the appearance of lightning, and his eyes as flaming torches, and his arms and his feet like unto burnished brass, and the voice of his words like the voice of a multitude." — Daniel 10:6 (ASV)

Beryl. —Hebrew, Tarshish, a variety of the topaz.

His feet. —More correctly, the place where his feet were, or the lower extremities of his limbs. We are not told in what position the man was when Daniel first saw him. Later on (Daniel 12:6) he is described as being upon or above the waters. In this position he symbolizes God as supreme over the nations who are represented by the Tigris.