These rock crystals are made from a mineral called gypsum and they are over a meter long.

这些体由一种叫做膏矿物构成，长度过一米。

And then those are an ancestor of Liezenstein and reading stones, which I think were often made of something like rock crystal.

然后这些是利森斯坦和读，我认为它们通常是由类似水材料制成。