There are many interesting places, many interesting worlds. This world is not one of them. It has an argon atmosphere, and the planet itself is made of a very unreactive, insoluble, extremely difficult to erode, not at all shiny or luminous, monotone grey powder. It is about as dense as sand.

You need not think of how this world came to be, but if you can think of a very good reason why such a planet would come to be, then by all means say it. If necessary, the substance may be synthetic, but avoid anything along the lines of complex or organic molecules.

To eat it would be pointless, but it should not poison you if you did. The alchemists who teleport there babble about the dust having unlimited potential, but then nobody actually takes them seriously. Perhaps it does have such properties.

What is the best candidate for such a material?

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    $\begingroup$ "doesn't erode" - is it the only distinct characteristic that differentiate this sand from regular sand? $\endgroup$
    – Alexander
    Mar 2, 2018 at 17:13
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    $\begingroup$ Silicon dioxide is not really soluble, and quite inert chemically. Admixtures will make it gray and opaque (there are plenty of gray sands here on Earth). That leaves, from my point of view, only hardness. Quartz is 7 on Mohr scale - you need more? $\endgroup$
    – Alexander
    Mar 2, 2018 at 17:29
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    $\begingroup$ Philosophically speaking, can you really have a least interesting planet... $\endgroup$
    – Giter
    Mar 2, 2018 at 20:43
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    $\begingroup$ Unreactive, insoluble, abrasion-resistant material? Sounds like a great substance to make your alchemy equipment out of. $\endgroup$
    – Mark
    Mar 2, 2018 at 22:44
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    $\begingroup$ If your planet is covered in sand, what do you mean by saying that the sand doesn't erode? Sand gets blown about by the wind. $\endgroup$ Mar 3, 2018 at 14:30

7 Answers 7


Welcome to Planet Basalt!

You want grey? You got grey. Basalt is mainly composed of silicon dioxide(white colored), magnesium oxide(white), calcium oxide(white), aluminum oxide(white), and iron(II) oxide(black). The darker grey areas that you see on the Moon are basalt dust. If there was wind on the Moon, it would definitely be boringly covering the entire surface rather than being in concentrated mildly-interesting 'seas'.

You want simple? You got simple. Basalt is formed when silicate-heavy lava cools rapidly when exposed to the surface. Because of the rapid cooling, large crystals don't often form in it, giving a very monotonous, fine-grained texture.

You want dust? You got dust. Basalt weathers quickly compared to many other rocks, so the winds on this planet will quickly turn the surface into dust. It's good that the planet has a non-oxygen atmosphere, as a lack of free oxygen will prevent the iron commonly found within basalt from oxidizing and turning red.

You want alchemists to think it's useful? Alchemists could think it's useful. Basalt dust can be used to make a mineral wool called basalt fiber. This fiber can be used as thermal insulation, and thermal insulation isn't that interesting to the common person. However, the fact that a vocanic rock can be alchemized into fire resistant cloth is enough to get any alchemist interested.

Addition, because I forgot it needed to be more boring than sand:

You want more boring than sand? 90% of basalt is more or equally as boring than sand. The other 10% might catch on fire. Most sand on Earth is composed of silicon dioxide, which is quite reactive and somewhat water soluble. Let's see how the major components of basalt compare to silicon dioxide:

  • Silicon dioxide, 45-55%. About half of basalt is just regular sand, so about half is at least as boring/interesting as sand.

  • Magnesium oxide, 5-12%. Magnesium oxide is prized for being physically and chemically stable at high temperatures, it lowers acidity, and is not very water soluble. So, a bit more boring than sand.

  • Calcium oxide, <10%. Unfortunately, calcium oxide reacts with water and produces heat, so it definitely is more interesting than sand. However, it neutralizes acids and dehydrates whatever it touches, so in a way it makes other things boring. Furthermore, if just enough water was evenly added to the planet then all of the water and calcium oxide would combine and become calcium hydroxide. This chemical is used in the food industry due to "the mildness of its basic properties", which is an exceptionally boring description.

  • Aluminum oxide, >=14%. Aluminum oxide is primarily just used to make aluminum. Other than that, the fact that is pretty inert means that is used as a catalyst in the production of other chemicals, i.e. it makes other things interesting without becoming interesting itself.

  • Iron oxide, 5-14%: Iron oxide is used as a pigment because of its consistent coloration and water insolubility, so it's quite nonreactive. However, this means that it can be used to make interesting tattoos.

In summary, the components of basalt are mostly boring, with one notable exception. About 50% is just regular sand, about 35-40%(magnesium oxide, aluminum oxide, iron oxide) are used in applications where being inert is a good thing, and 10%(calcium oxide) heats up when exposed to water. That last 10% of calcium oxide could be what the alchemists are interested in, whereas normal people just see the boring 90%.

  • $\begingroup$ Basalt weathers down mostly to a common silica sand. However, if atmosphere is argon, that won't be the case. That sand, however, will be more chemically reactive than silica. $\endgroup$
    – Alexander
    Mar 2, 2018 at 18:59
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    $\begingroup$ Well, Magnesium Oxide is quite stable and makes good pots for holding molten metal when mixed with Silica and Aluminium Oxide, but Magnesium Metal has a bad habit of bursting into flames and will happily keep burning even when being smothered with a CO2 fire extinguisher. $\endgroup$
    – Samwise
    Mar 2, 2018 at 21:04
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    $\begingroup$ I just have to say that you explained one of the most boring materials in a very entertaining way. $\endgroup$
    – skout
    Mar 3, 2018 at 2:08
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    $\begingroup$ @skout: Explaining boring things well is a surprisingly useful skill in life. $\endgroup$
    – Giter
    Mar 3, 2018 at 13:00
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    $\begingroup$ @Ronjohn, the lunar surface is eroded by the solar wind, which is mostly protons. I think Argon would be more effective. $\endgroup$
    – prl
    Mar 4, 2018 at 1:25

It's deactivated Grey goo, Smartdust, Programmable matter, Computronium, or something like that.

Basically trillions of nano machines that at some point in the past ate the planet and converted it all into more machines, and then when there was nothing left they turned off. Now it's just this inert dust like stuff. After all this time it's probably harmless...

Edit: So something a little simpler.
If you are looking for something like a single element/compound, you could look into most of the transition elements. They are all metal, and non-reactive.

Best possibility I can think of might be powered Aluminium oxide. It's hard, dull grey, and would be extremely interesting to alchemists.

Something like a tungsten dust. It has a dark grey color.

Another possible option is impure carbon. It's very hard, and with the right impurities would be opaque, though possibly not dull.

  • $\begingroup$ I really like this answer, and I've upvoted it, but unfortunately, it's not really what I'm after. $\endgroup$
    – Piomicron
    Mar 2, 2018 at 18:07
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    $\begingroup$ xkcd.com/865 $\endgroup$
    – Cody
    Mar 3, 2018 at 0:24
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    $\begingroup$ @Cody Internet of Hungry Things $\endgroup$
    – LSerni
    Mar 3, 2018 at 9:30
  • $\begingroup$ It is actually an old poo pellet from Great A'Tuin (wiki.lspace.org/mediawiki/Great_A'Tuin) that has fully decomposed $\endgroup$
    – ivanivan
    Mar 4, 2018 at 15:28

graphite powder


You need not think of how this world came to be, but if you can think of a very good reason why such a planet would come to be, then by all means say it. If necessary, the substance may be synthetic, but avoid anything along the lines of complex or organic molecules.

The planet is a worthless ball of rock whose only remarkable quality is a resistance to corrosion and being drilled through. It might be basalt, or granite, possibly mixed with even harder substances (e.g. moissanite - but not large crystals as they might be valuable). It might be covered in soot. The atmosphere is worthless and unbreathable. That's exactly the point.

It has been engineered that way to act as an enormous shield for the civilization (possibly virtualized in computronium) that dwells several hundred kilometers beneath. They weren't interested in interstellar voyages, feared that someone warlike or otherwise unagreeable might come by, so they retreated and made their whole system as unappealing as possible.

(I would not be surprised if some smaller asteroids and satellites in the system were actually extreme-endurance self-repairing kinetic energy weapons, designed to stop the occasional wandering planetoid).

The alchemists who teleport there babble about the dust having unlimited potential

That's more difficult - boring and with unlimited potential? Either solve it literally: the dust is carbon. Soot, or graphite. Unlimited potential, except it isn't worth the expense to mine from the gravity well. Or it might be made up of the dead nanomachines that deathformed the planet to make it worthless real estate, but in that case the dust might contain some valuable trace elements, which won't do.

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    $\begingroup$ The unlimited potential was edited in. Besides, alchemists might think such things, that doesn't make them true... $\endgroup$
    – Piomicron
    Mar 3, 2018 at 0:23
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    $\begingroup$ Of course we then ask, "where does a planet-sized ball of basalt come from? $\endgroup$
    – RonJohn
    Mar 3, 2018 at 5:53
  • $\begingroup$ @RonJohn from lots of solar energy and every other silica-bearing body in the solar system, during a period of several hundred thousand years. These guys took the very long view. $\endgroup$
    – LSerni
    Mar 3, 2018 at 9:28

This is interesting an interesting question. Like Giter answered, you could have the surface made of weathered basalt. Here is my idea for forming the planet: In a developing solar system, a rocky planet closer than the snow line gets hit by another protoplanet of almost equal size. They hit at an angle so that a large amount of the planet gets pulverized and thrown into orbit as a large ring system, and the main planet gets almost completely melted. The material in orbit however stays as a very separated ring, and no large moons form.

Because the collision was so large, it knocks the planet out of the system and burns away all volatiles that existed on the planet before. Now a rogue planet, far from any star and left to drift for billions of years, it cools down, re-solidifying the rock in orbit and on the surface into basalt. The particles and moonlets in the ring slowly de-orbit, and pulverize the surface into gravel and dust. The rogue planet, left alone for so long, also gradually releases helium gas from decaying uranium in it's core, which is a noble gas unreactive like argon, into the atmosphere, which doesn't get blown away like it does around a star.

The planet is a cold dark body, flying alone under the stars, with a grey dusty and gravelly featureless surface, and an inert transparent helium atmosphere.

  • $\begingroup$ Not bad. Welcome to the site, take our tour. $\endgroup$
    – Theraot
    Mar 4, 2018 at 6:09

Your search is doomed. The best you can hope for is to make it a moderately uninteresting planet.

Making it too uninteresting would attract attention. It would be at the extreme of a bunch of distributions.

So you need to figure out what makes planets interesting to civilizations.

  • You want it to have little water. Most of the processes that concentrate ores into useful concentrations have water in some stage of either the creation, precipitation or transport. You don't want zero water. THAT would attract attention.
  • You want to have an unremarkable atmosphere but one that is not breathable. For commercial exploitation a breathable atmosphere makes everything a bunch easier.
  • Give it a somewhat larger mass and a somewhat larger diameter. This makes the escape velocity higher, the atmosphere thicker, and doing anything on the surface more tiring. The surface light would be dim, the sky murky looking
  • Give it somewhat more axial tilt. This makes the seasons more extreme and more unpleasant.
  • For similar reasons give it a longer year.
  • Put some unpleasant material in the atmosphere. Carbon dust, silica dust. This tends to get everywhere, and make life difficult. If one of the materials is a moderately bad conductor then it has potential to mess up electronics.
  • Your planet formed in a region where there weren't many supernovae, so while the crust has a fair amount of light elements it's impoverished in heavy elements.
  • It has little magnetic field due to lack of iron. Solar wind blasts at the atmosphere. Good thing you started with greater mass. The solar wind has finally blasted enough away that you aren't stuck in eternal searing black calm like Venus.
  • It's a long way from anywhere, off the beaten track
  • The stellar system has no asteroid belt to speak of.

As an example of what some civilizations find interesting, consider Poul Anderson's "Satan's World" This was a rogue world between stars. It was going to encounter a fly past near a blue giant star when discovered.

So what use is a frozen planet soon to be well baked?

  • It had water.
  • No life.
  • Normal geology.
  • Colder than a banker's heart, mostly. (A few months near a bright star will revive the atmosphere, get the top of the oceans warm, but do little else.

In his novel they used it for mass transmutation, using the oceans at heat sinks. As the planet retreated back into the stellar night the level of transmution increased to keep the planet at a reasonable temperature.


Depending on their technological level (I assume they teleported with magic or similar alchemic stuff and not an elaborate highly technological machine), you might also take stuff into consideration that today would be very interesting and valuable like titan but useless in past times because there was no way to easy way of fabrication.


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