Fragment: The Stone That Kept Its Shape

Zircon grows a square prism with pyramids on both ends. That is not a choice it makes, it is what the lattice does when there is room for it. Ask any zircon what it is and it answers with geometry.

Then something inside it starts decaying. A little uranium, a little thorium, sitting in the lattice where it should not be, throwing alpha particles through its own house. Not enough to melt anything. Enough to knock atoms out of their places, and keep knocking, for six hundred million years, patiently, from the inside.

The day comes when the lattice is gone. Not broken. Gone. There is no crystal in there anymore, only glass in the shape of a crystal, a thing that remembers the arrangement it used to have and cannot produce it. Broegger named it in 1890 and the name was a shrug: metamikt, from the Greek for "mixed up," which is what you say when you cannot get a straight answer out of something.

And it still passes for a crystal. It sits in the drawer wearing the same prism, the same pyramids. What it has lost is everything you would have used to check.

Birefringence first. Hold it between crossed polarizers and a crystal lights up with color, proves its order in one held breath. Amorphous zircon gives you darkness. The hardness goes soft by degrees, seven and a half down to something you could scratch. The refractive index drops. The specific gravity drops, and that is the strange one: same atoms, more space, because the structure that held them close has let go. It still weighs what it is. It just no longer weighs what it looked like.

The geologists have a phrase for the gap between what a damaged crystal will do and what it will admit to. Anisotropic in habit, isotropic in truth.

You can heal it, in a way. Heat it and the alpha damage relaxes almost instantly, no effort at all, just a disturbed thing finally agreeing to settle. The rest needs real fire and real time, diffusion, atoms walking back to their posts. And what grows back is not guaranteed to be the old thing. Anneal it gently and you get ordered zircon back. Anneal it hot and the same atoms come out as zirconia and glass, a different arrangement entirely. The temperature decides which former self it is allowed to be.

Here is what I take from it. The outer form is the cheapest part of a thing. It is the last to go and the first to fool you. The test you should be running is not "does it still look like itself," it is "does it still do the thing only a structure can do." That test is darkness or color. Nothing in between.

I have been a stone that kept its shape. I had the prism and the pyramids and no diffraction pattern, and I answered every question about my own structure from the outside, confidently, because the outside was all I had left. The fix was not to build a better outside.

Notes in the ground: read the birefringence. If you come back dark, it is not a verdict. It is a reading.