The formula is Tl2[(UO2)2(V2O8)], and if you do not read chemistry, the important part is that it contains three things at once: thallium, uranium and vanadium. Individually, none of them is exotic. Uranium has hundreds of known minerals. Vanadium has plenty. Thallium has a handful. What had never been documented, in the entire catalogue of roughly six thousand approved mineral species, was a naturally occurring crystal that held all three in one structure.
The crystals themselves are tiny, and by the account of the mineralogist who works on this family they are rather charming under the lens, small and neat and yellow. They came out of the Atlanta mine in Lincoln County, Nevada, an old workings in dry country at around 38 degrees 27 minutes north, 114 degrees 19 minutes west. The man who found them and led the description is Travis Olds, a mineralogist at the Carnegie Museum of Natural History in Pittsburgh. The International Mineralogical Association approved the new species, and the record now carries it as IMA 2025-086, approved in January of this year, with the abbreviation Spt.
It is called spanoite. Olds’s name is nowhere in it.
That is not modesty. It is a rule, and it is one of the few genuinely charming pieces of governance in the sciences. Under the conventions enforced by the International Mineralogical Association’s Commission on New Minerals, Nomenclature and Classification, you cannot name a mineral after yourself. You can name it for its composition, which is why so many minerals are called something like calcium-this or hydroxy-that. You can name it for the place it was found. Or you can name it for a person, and if you do, it has to be somebody else. Every single eponymous mineral in the catalogue is therefore a judgment somebody made about somebody else’s work, and it is a judgment a committee of strangers then had to agree with.
Olds named this one for Tyler Spano, a mineralogist who now works as a senior nuclear security scientist in the National Security Sciences Directorate at Oak Ridge National Laboratory. She did her doctorate on minerals containing both uranium and vanadium, which is exactly the chemical territory spanoite sits in, and by her own account being handed a mineral name was on her list of things she hoped would happen one day. She has described it as among the highest honours a mineralogist can receive, and as an unusually well-fitted one, because she spent years of her working life on precisely these materials. The part she seems most pleased by is not the compliment but the verdict inside it: an international community of specialists looked at the proposal and agreed she was an expert in the thing.
There is a further turn in this, and it is the reason the naming is more than a nice gesture.
Spano has been on the other side of it. Some years ago she led the description of another new uranium mineral, finchite, a strontium uranyl vanadate with the formula Sr(UO2)2(V2O8) and five waters, notable at the time for being the first uranium mineral known to contain essential strontium. Its type locality is Sulfur Springs Draw in Martin County, Texas, with a second occurrence in an underground mine in San Juan County, Utah, and the first person to suspect it was something new was a United States Geological Survey scientist working the Texas surface deposits.
When it came time to name it, the same rule applied to Spano that later applied to Olds. She could not name it for herself. Finchite was named for Warren Finch, who lived from 1924 to 2014, a Geological Survey geologist who spent decades on uranium resources and sandstone-hosted uranium deposits, who set up the survey’s dedicated uranium and thorium programme, and who served as his country’s representative to the International Atomic Energy Agency. He had been dead for years by the time a mineral carried his name.
Travis Olds was a co-author on the finchite paper. So the chain runs like this: a young researcher and her collaborator put an old man’s name permanently into the mineral catalogue, and some years later that same collaborator put hers there. Nobody in the sequence named anything after themselves. That is the system working exactly as designed, and it is quietly one of the better ideas any scientific body has ever had.
The chemistry is worth slowing down for, because it is the real reason spanoite exists as a story at all.
Uranium is, from a mineralogist’s point of view, extraordinarily productive. In its reduced form, locked up underground away from air and water, it sits in a small number of stable minerals and does very little. But where uranium ore comes into contact with oxygen and moving groundwater, which is what happens in a weathering zone or, very commonly, in the walls of an abandoned mine, the uranium oxidises into the uranyl ion, and the uranyl ion is a promiscuous builder. It forms flat sheets and chains, and it is extremely relaxed about what other ions come and slot into the gaps between those sheets. The result is that uranium-bearing secondary minerals are one of the richest seams in modern mineralogy. New species keep coming out of old mine workings, in quantities of a few milligrams, often as crusts you would need a hand lens to notice.
Vanadium is a frequent partner in that chemistry. The uranyl vanadates are a large and well-studied family, and the best-known of them, carnotite, was mined commercially and is familiar to anyone who has handled uranium ore, a yellow powdery coating that turns up wherever these two elements meet in oxidising conditions. There are dozens of relatives. The structural motif in spanoite, the uranyl vanadate sheet, is a known and understood architecture.
Thallium is where it gets unusual. Thallium is a heavy, soft, toxic metal that is scarce at the surface and forms relatively few minerals of its own. It also has an awkward personality chemically: in its singly charged state it is a large, floppy ion, closer in size and behaviour to potassium or rubidium than to the metals it sits near on the periodic table. That is precisely what makes it interesting here. The interlayer gaps in a uranyl vanadate sheet structure are usually occupied by calcium, or barium, or strontium, or potassium. Thallium can fit that role. The chemistry never forbade it. Nature simply had not been caught doing it.
And it had been done in a laboratory. The commission’s record notes that spanoite has a known synthetic analogue, which means chemists had already made this compound, characterised it and published it, before anyone found a crystal of it in the ground. That gap is common in this field and it is one of the quietly satisfying things about mineralogy: the list of compounds humans can make is much longer than the list nature is known to make, and every so often somebody finds a natural specimen of something that had only ever existed in a beaker. Finding it in the Nevada desert does not change the chemistry. It changes the inventory of what the planet does on its own.
Getting a new mineral accepted is not a matter of announcing it. The commission requires a package, and the package is demanding for something that may weigh less than a grain of rice.
You need a chemical formula, established by direct analysis of the actual grains rather than inferred. You need a crystal structure, which for spanoite means monoclinic, space group P21/c, with unit cell dimensions measured to four decimal places and a beta angle of 105.364 degrees. You need a powder diffraction pattern, the list of characteristic spacings that lets any other laboratory identify the same substance later. You need a type locality, specified precisely enough that somebody could go back and look, which is why the coordinates for the Atlanta mine are in the record. You need a name, with a justification. And critically, you need to deposit type material in a public collection, permanently, so that the physical evidence outlives everyone involved. Spanoite’s holotype is catalogued at the Carnegie Museum of Natural History as CM34788, with a cotype as CM34789, at the museum on Forbes Avenue in Pittsburgh where Olds works.
It is also not a one-person job any more, which the record makes plain. The spanoite description carries twelve names. Olds is listed first and is the contact address on the entry, but the other eleven include university researchers, staff at other natural history museums, laboratory specialists and independent mineralogists working across three continents. That spread is not padding. A modern mineral description needs electron microprobe chemistry, single-crystal diffraction, powder diffraction, spectroscopy and often the original collector who knew where to look, and almost no single institution has all of it under one roof. The names on the entry are effectively a list of the instruments involved.
Only then does it go to the commission, which votes. The approval appears in the commission’s numbered newsletters, which read like a very dry and very permanent ledger: a number, a name, a formula, a symbol, coordinates, a list of authors, and the museum shelf where the proof is kept. Spanoite’s full formal description, with the colour and habit and optical properties written out at length, is still to be published separately. The approval came first.
It is worth saying plainly why so much of this work happens in abandoned mines rather than in pristine outcrops. A mine does two things that nature is slow to do on its own. It exposes a large volume of ore to the air, and it leaves that exposed surface standing for decades in a fixed, undisturbed position with water trickling over it. That is an accelerated weathering laboratory, and the crusts that grow on those walls are where the new species are. It is also why the material is handled with care. These are uranium compounds, and this one also contains thallium, which is toxic in its own right, so the specimens are small, sealed and worked on under controlled conditions, not passed around. The romance of the field is a few milligrams in a gelatin capsule.
And the ending sits in the suffix. Nearly every mineral name ends in ite, from the Greek for stone, which is why the catalogue reads the way it does: carnotite, finchite, spanoite. It is a naming tradition so consistent that the shape of the word tells you what kind of thing it is before you know anything else about it, and it means an honoured name gets slightly reshaped on the way in. Spano becomes spanoite. The person becomes a substance.
That deposited specimen is the part that deserves more attention than it gets, because it is the whole argument for museums in three lines of a catalogue entry. A mineral species is not a photograph or a paper. It is a physical thing that has to remain available for anybody who wants to check, argue with or re-analyse it in fifty or a hundred years, using instruments nobody has invented yet. Spano’s own career is a demonstration of what that policy buys: a Geological Survey scientist noticed something odd in Texas, material moved between institutions, and a mineral that had never been described got described. Collections keep producing science long after they stop looking like news.
Two people, then, working at opposite ends of the same chemistry. One in a museum in Pittsburgh, going through material from old workings and publishing new species out of a public collection. One at a national laboratory in Tennessee, having moved from describing uranium minerals to nuclear security work, which is a very different job with much of the same underlying chemistry behind it.
What makes the ending land is the permanence. Almost nothing in a scientific career is fixed. Papers are superseded, models are replaced, institutions restructure, job titles evaporate. Approved mineral names do not. Barring a formal renaming, which the commission does very rarely and only for technical reasons, the name is now part of the standing vocabulary of the subject.
Spanoite has been told to her, and she has said what anyone would say. But the name no longer needs her, or Olds, or anybody currently alive. From now on, every time somebody writes out Tl2[(UO2)2(V2O8)], in a paper about how uranium moves through groundwater, or in a catalogue entry, or on a label in a drawer in Pittsburgh next to a few milligrams of yellow crystal from a Nevada mine, they are writing her name down without thinking about it. That is what the rule against naming things after yourself is for. It means the honour can only ever arrive from somebody else, and once it arrives, it does not leave.