I Found this in Ossett, West Yorkshire UK. It is carboniferous In age. I want a second opinion because I'm almost positive it's a calamite but I'm not sure. If it is a calamite, how much could it be worth. Also note it has no restoration or repair and it doesn't have any chips. Also it is 3 inches tall and 3 inches thick, and it has tiny sparkly stonesinside which I believe are crystals.
It is in the class Equisetopsida (Sphenopsida), and probably in the order Equisetales.
Within that, one of the genera in the Calamitaceae is most likely; perhaps Calamites or Annularia.
One should also consider Equisetites - see here - http://en.wikipedia.org/wiki/Equisetaceae.
Many specimens of this group of fossil plants, like yours, simply do not contain enough material/information to allow an accurate ID.
Note that calamite is not a real word. In the singular, you may refer to a specimen or piece of Calamites.
The sparkly bits will be crystals of minerals either within the rock comprising the fossil, or possibly as remnants of a vein crossing the specimen (providing a weakness along which the specimen broke).
It is a nice clean specimen, though rather short.
Value: I suggest you look for similar specimens on eBay, but don't get your hopes up.
It sounds as if you might appreciate the extra detail afforded by using a binocular microscope; they can be bought second hand at reasonable prices. In the field, a hand lens (as I mentioned in a previous post) is the tool, though it can be used in the lab as well. But a binocular microscope is a better lab tool. That's designed for looking at the surface of hand specimens in reflected light. The other sort of microscope commonly used by geologists is a petrographical microscope, which is designed primarily for looking at thin sections of rock - thin enough that they are translucent. That allows the component minerals to be seen in transmitted light, either plain- or cross-polarized. If you're excited by the little crystals you see in your Calamites specimen, you'd be amazed at how even a dull-looking rock's minerals look in transmitted cross-polarized light! Have a look here - http://micro.magnet.fsu.edu/primer/techniques/polarized/gallery/pages/gneisshornblendesmall.html
Great find Dan
We have found similar specimens on the Holderness but they are few and far between.
Mike answered your question about how much it was worth and I too would have said have a look on that great auction site in the sky!
If it's one of your best specimens I would keep it untill you had a better one then trade it on for something better.