² sn H. H. Rowley (Job [NCBC], 181) suggests that if it is lapis lazuli, then the dust of gold would refer to the particles of iron pyrite found in lapis lazuli which glitter like gold.

⁷ tn Or simply, “like lightning.” The term “lightning flash” (בָּרָק, baraq) is often used to compare the brightness of an object to the flash of lightning: the glory of Yahweh (Ezek 1:13), the splendor of an angel (Dan 10:6), the glitter of swords (Deut 32:41; Ezek 21:15; Nah 3:3; Hab 3:11), and the gleam of arrowheads (Job 20:25). It is also used as a figure (hypocatastasis) for speed, such as the swift destruction of an enemy (Zech 9:14). Perhaps both images are suggested here: the bright glitter of the chariots (v. 4b) and the speed of the chariots as suggested by the verb “they dash here and there” (יְרוֹצֵצוּ, y^erotsetsu, v. 5b).