Standardiametite

Standardiametite is a rare, naturally occurring mineral with the chemical formula (NH4)2Fe(SO4)2·6H2O. It was first discovered in the 19th century and is named after the standard unit of length, the meter, due to its unique crystal structure that resembles a meter stick. Standardiametite is typically found in the oxidation zones of sulfide-bearing deposits, often associated with other secondary minerals such as jarosite and melanterite.

The mineral forms as a result of the oxidation of iron sulfide minerals, particularly pyrite, in the presence of ammonia and sulfuric acid. This process leads to the formation of standardiametite crystals, which are usually prismatic in shape and can grow to several centimeters in length. The crystals are typically bright yellow to orange in color, although they can also appear brownish or reddish due to impurities.

Standardiametite is of limited economic interest due to its rarity and the fact that it does not contain any valuable elements. However, it is sometimes collected by mineral enthusiasts for its unique appearance and the interesting geological context in which it forms. The mineral's name and crystal structure have also made it a subject of interest in crystallography and mineralogy.

In summary, standardiametite is a rare mineral with a distinctive crystal structure and chemical composition. It forms through the oxidation of iron sulfide minerals and is typically found in the oxidation zones of sulfide-bearing deposits. Despite its limited economic value, it is of interest to mineral enthusiasts and researchers in the fields of crystallography and mineralogy.