They are copper and if soaked in vinegar the tarnish will come off and they will shine again.
It is impossible to bring back originial mint luster. That luster can only come from the process of striking the coin -- there's nothing you can do to bring it back.
Luster = how much the mineral reflects light, so yes, all would have luster, but some are metallic and some are non-metallic
All minerals have luster. There are different types of luster. Pyrite has metallic luster.
Lead has a metallic luster and is white in color. Aluminum, copper all also have metallic luster. Minerals do not have any metallic luster.
Yes, many metals (not all) have a luster and are malleable.
No, not all metals and metalloids have luster. Luster is a property of metals that allows them to reflect light, giving them a shiny appearance. Some metals and metalloids may lack luster due to factors such as surface oxidation or impurities.
No, not all minerals have a glassy luster. Minerals can display a variety of lusters, including metallic, dull, pearly, and waxy, depending on their composition and crystal structure.
no Actually, YES. All minerals have luster of some sort. Marble would be a non-metallic luster, and from there you have to figure out its other qualities.
A waxy luster gives minerals a shiny appearance.
Luster is the quality off shining by reflecting light on a stone. Fluorite is a popular mineral of all colors, the luster being vitreous.
It would depend on how many pennies they had!
All pennies are worth a cent.