Berean Standard Bible (BSB)
Spread out above the heads of the living creatures was the likeness of an awesome expanse, gleaming like crystal.
World English Bible (WEB)
Over the head of the living creature there was the likeness of an expanse, like the awesome crystal to look on, stretched forth over their heads above.
Strong's King James
And the likeness{H1823} of the firmament{H7549} upon the heads{H7218} of the living creature{H2416} was as the colour{H5869} of the terrible{H3372}{(H8737)} crystal{H7140}, stretched forth{H5186}{(H8803)} over their heads{H7218} above{H4605}.
The F.O.G *
The F.O.G Message *
Young's Literal Translation
And a likeness is over the heads of the living creatures of an expanse, as the colour of the fearful ice, stretched out over their heads from above.