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Erbium is one of four, yes four, elements named after the same small village in Sweden: Terbium, Ytterbium, Yttrium, and Erbium. We're lucky they ran out of elements to discover or we would have ended up with Rbium or something. Erbium is important as a doping agent in optical fibers, where it enables the fiber to be optically pumped to act as an amplifier for signals passing through it.
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 Large rectangle of heavy foil.
This fabulous, rather valuable sample of erbium was most graciously donated by George (not 007) Lazenby, who saw the slashdot discussion. I don't know the exact thickness, but it's quite stiff and solid for a foil. A very, very fine specimen.
George got this and the other samples he donated at a surplus auction of his highschool. It seems he was the only one there who appreciated the erbium foil. This sample and the others he sent had been donated to the school by a former student who worked at NIST (National Institute for Standards and Testing), where they had been used as x-ray calibration standards. This means they are probably very pure.
In fact, analysis by x-ray fluorescence spectroscopy at the Center for Microanalysis of Materials, University of Illinois (partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439) indicates that it is at least 95% erbium, probably quite a bit more than that.
Source: George (not 007) Lazenby
Contributor: George (not 007) Lazenby
Acquired: 9 June, 2002
Price: Donated
Size: 2"
Purity: >95%
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  Lump.
This sample arrived with a full set of lanthanides at a time when I was missing europium, terbium, holmium, ytterbium, and of course lutetium.
This very kind donation from Max Whitby of The Red Green & Blue Company in England completed my element collection, to the extent that it gave me a plausible sample of every element one can plausibly have a sample of. (The Red Green & Blue Company is selling a periodic table collection containing similar samples of the same stuff, and if you want a ready-made collection of elements, that's the first place I would look.)
To learn more about the set you can visit my page about element collecting for a general description or the company's website which includes many photographs and pricing details. I have two photographs of each sample from the set: One taken by me and one from the company. You can see photographs of all the samples displayed in a periodic table format: my pictures or their pictures. Or you can see both side-by-side with bigger pictures in numerical order.
The picture on the left was taken by me. Here is the company's version (there is some variation between sets, so the pictures sometimes show different variations of the samples):
Source: Max Whitby of RGB
Contributor: Max Whitby of RGB
Acquired: 20 December, 2002
Price: Donated
Size: 0.5"
Purity: 99.4%
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Sample from the Everest Set.
Up until the early 1990's a company in Russia sold a periodic table collection with element samples. At some point their American distributor sold off the remaining stock to a man who is now selling them on eBay. The samples (except gasses) weigh about 0.25 grams each, and the whole set comes in a very nice wooden box with a printed periodic table in the lid.
To learn more about the set you can visit my page about element collecting for a general description and information about how to buy one, or you can see photographs of all the samples from the set displayed on my website in a periodic table layout or with bigger pictures in numerical order.
Source: Rob Accurso
Contributor: Rob Accurso
Acquired: 7 February, 2003
Price: Donated
Size: 0.2"
Purity: >99%
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Hollow cathode lamp.
Lamps like this are available for a very wide range of elements: Click the Sample Group link below to get a list of all the elements I have lamps like this for. They are used as light sources for atomic absorption spectrometers, which detect the presence of elements by seeing whether a sample absorbs the very specific wavelengths of light associated with the electronic transitions of the given element. The lamp uses an electric arc to stimulate the element it contains to emit its characteristic wavelengths of light: The same electronic transitions are responsible for emission and absorption, so the wavelengths are the same.
In theory, each different lamp should produce a different color of light characteristic of its element. Unfortunately, the lamps all use neon as a carrier gas: You generally have to have such a carrier gas present to maintain the electric arc. Neon emits a number of very strong orange-red lines that overwhelm the color of the specific element. In a spectrometer this is no problem because you just use a prism or diffraction grating to separate the light into a spectrum, then block out the neon lines. But it does mean that they all look pretty much the same color to the naked eye.
I've listed the price of all the lamps as $20, but that's really just a rough average: I paid varying amounts at various eBay auctions for these lamps, which list for a lot more from an instrument supplier.
(Truth in photography: These lamps all look alike. I have just duplicated a photo of one of them to use for all of them, because they really do look exactly the same regardless of what element is inside. The ones listed are all ones I actually have in the collection.)
Source: eBay seller heruur
Contributor: Theodore Gray
Acquired: 24 December, 2003
Price: $20
Size: 8"
Purity: 99.9%
Sample Group: Atomic Emission Lamps
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Element coin.
Dave Hamric sells element samples under the name Metallium. He's developed a line of coins struck out of various common and uncommon metals: They are quite lovely, and very reasonably priced, considering the difficulty of creating some of them.
Here is the back side of this coin (click either picture to see it larger):
Click the Sample Group link below to see many other coins made of various elements, or click the link to his website above if you want to buy one like this.
Source: Dave Hamric
Contributor: Theodore Gray
Acquired: 30 September, 2007
Price: $15
Size: 0.75"
Purity: >99%
Sample Group: Coins
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Torn ingot of erbium.
Description supplied by the source:
This is a chunk of erbium raw material, 3N pure, supplied by the Canadian company HEFA, meaning that this rare earth sample, like most other material used nowadays, actually comes from China. I chose this one because part of the lot/ingot # is visibly stamped on the top surface, which also shows the clamp marks and characteristic broken surfaces of having been mechanically 'torn' (not cut, actually ripped apart)
Source: Ethan Currens
Contributor: Ethan Currens
Acquired: 21 March, 2008
Price: Anonymous
Size: 1.5"
Purity: 99.9%
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BiTeEr lump.
This is a roughly bullet-shaped lump of what is described on the envelope it came in as about half Bi, half Te, and a trace of Er. Actually the exact percentages are given, but in deference to whoever discarded this item I'm not listing them, in case they represent some kind of secret formula for making really good lumps of metal, or something. Ethan seems to have gotten into a batch of strange tellurium compounds someone at his university was throwing away: I'm going to be listing more of them soon.
Source: Ethan Currens
Contributor: Ethan Currens
Acquired: 18 March, 2007
Price: Donated
Size: 1"
Composition: BiTeEr
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