Stoneye

Stoneye identifies the rock in your hand — and shows its work. Photograph the stone and Stoneye gives you a short list of candidates. Then it asks you questions you can answer at home: does it scratch glass, what colour streak does it leave on unglazed porcelain, does it break along flat faces. Each answer removes minerals from the list until one is left, or until the honest answer is "these two cannot be told apart without a lab". WHY THIS IS DIFFERENT Stoneye uses the model for one narrow job: reading the photo and proposing candidates. Every decision after that — which question to ask, which minerals to eliminate, what the final answer is — comes from a deterministic engine built on a table of 201 minerals, where every value is sourced and cited. The same answers always produce the same result. WHAT WE MEASURED We ran the engine against all 201 minerals in the table, three ways: •…