What is it? Opinions vary. The strangest is the claim that they are flying saucers. The writer tries to impress with his knowledge, but he made it unnecessarily complex and ridiculous.
Ezekiel's wheel is easy to see as the stars rotating around the Polar Star, as shown in the two images below. Chrysolite translates literally to "gold stone," with gold being seen as a color of the stars. The wheels rise from the earth with the living creatures because the stars rise from the horizon.
1516 17 18 19 20 21 (Ezek. 1:15-21)
Some believers claim Isaiah knew of a "round" earth long before science discovered it. Well not exactly. The circle of the earth describes the band of stars of the twelve Zodiac constellations. To Ezekiel, the totality of stars formed wheels as we see in the time lapse photograph below left. The singular wheel is formed from the twelve Zodiac constellations on the sun's ecliptic.