Let me help, it's not a meteor but a Burr puzzle (Memory dust if you want to use the example of items in genshin impact)
Wait, I am not saying his meteor is not a Burr Puzzle. However, that Burr Puzzle is used as a Meteor according to Genshin Wikia and various lore. I am mainly using Aerosiderite Lore.
In certain translations, it is said to be made of Meteoric Iron (CN,JP,KR) or Siderite (Spanish). However, I intend to treat it like a normal meteor since lore-wise it is considered a Meteor.
I might reduce to speed of it falling by half tho. However, it is probable that Zhongli's Meteor's material would be denser than the real-world counterpart as Skybracers Antlers which was a gift from Zhongli was strong enough to prop a mountain and raise Mount Tianheng even taller than before.
However, I will only be using Meteoric Iron's and Siderite's densities.
I am low-balling it, as in certain perspectives it appear quite large. From certain PoVs it appears to be as tall as The Stone Pillar, however in a number of PoV we can see it appears shorter than the pillar
I had guesstimated the size of pillars using Zhongli's Height (177.9) to be atleast 3.8m( I rechecked it) and taking his shoulder width as an average humans of 36 cm to get a guesstimate width of nearly 50 cm.
Also, it might seem like I am angry but I am really bad at expressing my tone over the internet.