It is a parallelepiped.
Not much, both have the same fineness (99.9% pure silver) and they could be the same product. An ingot is just a bar, so it would just be a silver bar of 99.9% pure silver in it. It tells nothing of the size, an ingot can be only a few grams in size, to several kilograms in size, and it doesn't tell you anything of value because of course an ingot only a gram in weight might be worth less than a dollar while an ingot several kilograms in size would be worth over a thousand dollars.
It is a parallelepiped.
The first year for Silver Eagles is 1986 and the US never struck any rectangular coins, it's likely a silver ingot bar.
There are a number of places where one could purchase a silver ingot at a discounted price. eBay, for example, has a good selection at bargain prices.
$500
As of February 2016, one gram of silver is worth 50 cents.
It weighs 1000 grains. This is equivalent to 64.79891 grams, or 2.08333 troy ounces, or 2.28571429 ounces avoirdupois.
Silver commodities are just what they sound like: the metal silver. Someone trading silver as a commodity rather than a precious metal is going to make a product from the silver, so they buy it in ingots. Precious metal traders buy bullion coins. If you're an industrial silver user, you can request your silver be made into whatever size ingot you want--within reason, of course; you're not too likely to order a 20,000-pound silver ingot even if you need that much metal--that it be alloyed with various metals to change its characteristics, or anything else you need to make your production as smooth as possible.
It is crafted like a boat only with iron ingots Iron Ingot Iron Ingot Iron Ingot Iron Ingot Iron Ingot
He fashioned the ingot into a small dagger.I found a gold ingot on the beach.
Silver ingots, as we normally see them, are usually essentially Pure Silver (element) with a very small percent of impurities alloyed (mixture.)