PbAl3(PO4)2(OH)5·H2O
Blue clarity expanding into boundless expression
The name combines two Latin roots: plumbum (lead), reflecting the mineral's lead content, and gummi (gum), describing the smooth, waxy, resin-like appearance of its rounded botryoidal surfaces. The name was coined by the French mineralogist François Sulpice Beudant when he formally described the mineral in 1832.
Plumbogummite's structure is built around lead (Pb²⁺) cations coordinated with aluminium phosphate layers and hydroxyl groups, giving it a layered trigonal lattice. It rarely forms distinct crystals; instead it almost always appears as botryoidal, kidney-shaped, or stalactitic crusts with a characteristic concentric internal banding.
Plumbogummite was first identified in 1819 at the historic lead mines of Huelgoat, Finistère, Brittany, France — its type locality. It was formally described and named by Beudant in 1832.
Because it forms as a secondary alteration product in the oxidised upper zones of lead ore deposits, it is found wherever lead-bearing minerals have been exposed to surface weathering over geological time. Significant occurrences include the Central Cobar Mines and Broken Hill in New South Wales, the Nifty Copper Mine in Western Australia, and the Siglo XX Mine at Llallagua in Bolivia.
Plumbogummite contains lead (Pb), a toxic heavy metal that accumulates in the body and can cause serious neurological and systemic harm with repeated exposure.
Do not inhale dust, grind, or polish dry. Never place this mineral in water intended for consumption or make crystal elixirs from it. Wash hands thoroughly after handling. Keep away from children and pets.
Plumbogummite is a textbook example of a secondary mineral: it does not exist in freshly formed rock but emerges only after millions of years of oxidative weathering destroy the original lead ore. This makes every specimen a physical record of geological transformation — lead sulphide unmade and remade into a phosphate by the slow work of water and time.
At ~4.0 g/cm³, plumbogummite is far denser than most phosphate minerals, owing to the heavy lead cation at the heart of its structure. This unusual mass-to-volume ratio gives even small specimens a striking, grounding weight in the hand.
"Love everyone, serve everyone, remember God, and tell the truth."— Neem Karoli Baba
Almost everyone carries a small held breath at the throat — the place where true things get caught on the way out, where the self has quietly built a wall to keep from being judged. Plumbogummite settles exactly there. Its smooth blue calm loosens that wall, not by making you louder but by making you truer: the words that were braced behind the teeth find they can simply be said, and said plainly, without the old flinch of waiting for the reaction.
It works with a steady strength and stays long enough to reach the root of the habit rather than only its surface, and as it works the field seems to widen — you feel a little larger, a little more at one with the room you are speaking into, which is the real ground of confidence. What remains when something true has finally been spoken is a clean lightness, the ease of a thing no longer carried. And underneath it sits the quiet recognition that the one who feared the judgement was never as solid as it pretended to be.
"'I Am' is the first name of God. When you want to think of God, think: I Am."— Robert Adams