They saw the God of Israel. Under his feet was like a paved work of sapphire stone, like the skies for clearness.

And they saw the God of Israel and there was under his feet as it were a paved work of a sapphire stone, and as it were the body of heaven in his clearness.

Then I looked, and see, in the expanse that was over the head of the cherubim there appeared above them as it were a sapphire stone, as the appearance of the likeness of a throne.

Then I looked, and, behold, in the firmament that was above the head of the cherubims there appeared over them as it were a sapphire stone, as the appearance of the likeness of a throne.

A marble is a small spherical toy usually made from glass, clay, steel, plastic or agate.

Above the expanse that was over their heads was the likeness of a throne, as the appearance of a sapphire stone and on the likeness of the throne was a likeness as the appearance of a man on it above.

And above the firmament that was over their heads was the likeness of a throne, as the appearance of a sapphire stone and upon the likeness of the throne was the likeness as the appearance of a man above upon it.

If this account is accurate, it would rule out the Black Stone being an agate, basalt lava or stony meteorite, though it would be compatible with it being glass or pumice.

These are sand from near the Great Lakes, and you can see that it's filled with minerals like pink garnet and green epidote, all kinds of amazing stuff, and if you look at different sands from different places, every single beach, every single place you look at sand, it's different. Here's from Big Sur, like they're little jewels.