💎 The large stibnite crystals are made up of tiny building blocks called unit cells, in which atoms and sulfur combine in a regular arrangement. Unit cells repeat in a 3D pattern to form a crystal.
🎊 Happy New Year to all—we hope to see you at the Museum in 2024!
Despite grunerite having a strong showing in the early game, stibnite won, probably because it is pointy. Stibnite is a source of antimony and is typically found as these long radiating crystals reminiscent of the iron throne. Stibium was an older name for antimony, so antimony was given the symbol Sb. The name stibium stuck for geology but not chemistry!
SALT SALT SALT SALT SALT! Halite is delicious! It can be colorful! It can leave casts in rocks that tell us important things about the depositional environments of those rocks! Cubes! That is all.
Well they both are cool gray minerals that sometimes form these radial formations!
Stibnite is a source of antimony and is typically found as these long radiating crystals reminiscent of the iron throne. Answering a comment from last round: yes, it looks like stibium was an older name for antimony, so it was given the symbol Sb. And the name stuck for geology but not chemistry!
Grunerite, is an amphibole mineral found in metamorphosed banded iron formations with high interference colors in cross polarized light.
Here’s a diagram:
And here, @loxare was able to explain plane and cross polarized light and how that gives us fun colors:
Ok so crossed polars. What happens in PPL is the light is going in in only one direction, let's say up and down. But while it's in the mineral, it splits the light and rotates it, because molecules do that, it happens in chem too. So now the light is going in an X, but one side of the X is going slower than the other, because it was split and rotated. We can't see that with our eyes because why would we need to? But if we put in a side to side polarizer, then the time lag between the / and the \ makes the two wavelengths interfere with each other, and this creates a new, hybrid wavelength, which gives us the colours. Assuming I'm remembering correctly of course
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I went to the local pride festival yesterday, and my favorite local mineral dealer was back. I bought a nice stibnite crystal from them last year, but this year I found something even better.
This is a specimen of elemental sulfur, on (I think) Celestine matrix. It’s absolutely incredible, I’ve never even heard of double terminated sulfur crystals. Sulfur so rarely forms large crystals at all, usually just large waxy blobs. But these gorgeous gemmy rhombs?!? I’m not sure the camera does it justice, but they’re SO CLEAR! If sulfur wasn’t so soft, some of these would be almost facet-grade.
I tried googling for comparable specimens, to see if I got a good deal, and I literally couldn’t find any. There’s nothing similar available right now. Even the dealer said that they looked through a huge lot of specimens and only found two of this quality, and they kept the other one for themselves.