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Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite. Marcasite can also react with moisture to form sulfuric acid. These are the reasons why pyrite is used instead of real marcasite in "marcasite" jewellery.
Pyrite is used with flintstone and a form of tinder made of stringybark by the Kaurna people of South Australia, as a traditional method of starting fires. [17] Pyrite has been used since classical times to manufacture copperas (ferrous sulfate). Iron pyrite was heaped up and allowed to weather (an example of an early form of heap leaching ...
The world's most valuable coins usually have some combination of rarity, historical significance, unusual features and minting errors. When at least a couple of those boxes are checked, you can ...
Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".
Both basements and attics near and far were flooded by the tiny, round-shaped collectibles, which have now become worthless. They had a good run. However, nowadays individual Pogs usually go for ...
Here’s a look at six coins that have lost more than 90% of their value over the last decade and could become nearly worthless if they continue on the same trajectory for the next 10 years. Each ...
Fool's Gold, an OEL manga published by Tokyopop; Fool's Gold, a 1958 novel by Dolores Hitchens; Fool's Gold, a 1993 novel by Zilpha Keatley Snyder "Fool's Gold", a short story by Elizabeth Moon in the 1999 anthology Chicks 'n Chained Males
The third version of Nike's popular Air Jordan basketball shoes first went on sale in 1988. Of course, the vast majority of those shoes have been worn and worn out, but collectors have paid up to ...