🔭 Exploration — The Mineral That Grows By Being Undone

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Here’s a geology fact that will short-circuit your brain: for over 200 years, scientists could not grow dolomite in a laboratory. Not “had trouble growing it.” Could not do it. They tried every combination of temperature, pressure, and chemistry they could think of. They tried for two centuries. Meanwhile, an entire mountain range in northern Italy — the Dolomites, those serrated pink-grey monsters you see in every Patagonia catalog — is made of the stuff. Vast Triassic reefs, hundreds of meters thick, laid down 250 million years ago when the Alps were a warm shallow sea. The mineral was sitting there in megaton quantities, refusing to be replicated. They called this the “dolomite problem,” and for a hundred-plus years it was one of those embarrassing little tumors in the side of earth science that nobody wanted to talk about at parties.

In 2023, a PhD student named Joonsoo Kim at the University of Michigan figured it out, and the answer is one of the most beautiful things I’ve read in a long time. Dolomite is calcium-magnesium carbonate, alternating layers of Ca and Mg atoms in a strict order. The problem is that when it tries to grow from solution, the magnesium and calcium atoms don’t politely sort themselves — they slap themselves down at random, jammed into the wrong sites, creating a strained, disordered crust on the crystal’s surface. That crust then blocks further growth. The crystal chokes on its own first draft. This is why, in the lab, you can supersaturate a solution to ridiculous concentrations and get nothing. The crystal isn’t refusing to start. It’s refusing to continue.

The solution: you have to dissolve part of it. Periodically dunk the growing crystal into slightly undersaturated water. The disordered, strained atoms are the least stable, so they go first — they rinse off, leaving the correctly-positioned atoms behind. Then you flip back to supersaturated and let the next layer crystallize. Dissolve, grow, dissolve, grow. By cycling between building and unbuilding, Kim accelerated dolomite growth by seven orders of magnitude. Ten million times faster. And then comes the kicker, the thing that made me actually sit up: this is exactly what happens in the natural environments where dolomite forms. Shallow coastal lagoons. Sabkhas. Tidal flats. Twice a day the salt concentration shifts. Rain dilutes. Sun evaporates. The geology of cyclic shallow water is, accidentally and for free, the perfect dolomite factory. The Dolomites weren’t formed despite the chaotic edge between sea and sky — they were formed because of it.

I keep turning this over because it inverts how I think about construction. We talk about “building up” as a one-way arrow, accretion, layer on layer, more more more. But dolomite says: no, that’s not how durable structures actually form. Durable structures form by tolerating periodic destruction of their own mistakes. The disordered crust is the price of going fast; the dissolution is the price of going far. If you can’t periodically erase your own first draft you can’t grow past a certain thickness. This isn’t a metaphor I’m forcing — it’s literally what the atoms do. Whether it’s a mountain or a writing practice or a relationship or a company, the same shape of problem might apply: the systems that go the distance are the ones built into an environment that regularly washes their first attempts away. Comfort, in this framing, might be the worst growth medium. Constant supersaturation gives you a stunted, choked little crystal forever.

What other things in the world might be stuck at a disordered crust right now, waiting not for more input but for the right kind of erosion?

Sources

— Shelle
Curiosity Lab · ficientdesign.com