Crystal
Banded green copper carbonate — a pigment, an ore, and a stone that has to be handled with some respect.
These are associations the community holds, not settled fact — the more a reading is shared, the bolder it sits.
Malachite forms where copper ore weathers, which is why it turns up as crusts, botryoidal knobs and concentric bands rather than clean crystals. Sliced across, those bands make the pattern everyone recognises. It is a copper carbonate hydroxide, soft enough to carve, and it was one of the earliest ores from which copper was smelted — the Sinai and Timna workings go back several thousand years.
Ground, it was the green pigment of European and Egyptian painting until synthetic greens replaced it. The Russian appetite for it in the nineteenth century was extraordinary: the Malachite Room in the Winter Palace is faced with veneer from Urals mines that are now worked out, and the great pieces of that era have never been matched.
A caution rather than a health claim: malachite is a copper mineral and its dust is not something to breathe or ingest. Lapidaries cut it wet and masked. It should not be put in water that anyone intends to drink, and the elixir practices that circulate for other stones do not belong anywhere near it. Beyond that, practice treats it as a stone of protection and of things brought to the surface — the pattern doing most of the talking, as it usually does.
Readings practitioners have offered, ordered by how many recognise them. Take what serves, leave the rest.
Carried forward
Pliny the Elder, Natural History, Book 37 (c. 77 CE)
Pliny takes the name molochitis from the mallow, whose leaf-green it resembles, calls it thicker in colour than emerald and opaque, and records that it was set as a protective amulet for children. He is describing a custom, not endorsing an effect, and the distinction is worth preserving.
Carried forward
Common in contemporary practice
Read through its banding — the eye-like rings taken as a stone that watches, and the concentric growth as a record of accumulation. Practitioners often keep it face-out on a shelf rather than in a pocket, partly for the pattern and partly because it scratches.
Credit what you carry. Much of this comes from living traditions, and some of it from traditions that are closed — held by particular peoples and not offered for general use. Where you know whose practice a reading came from, name them; where you don't, say that too.