Neineen

Neineen is a rare and unique mineral that was first discovered in the late 19th century in the Neineen River area of Greenland. It is named after the river due to its distinctive green color, which is a result of the presence of chromium and nickel within its crystal structure. Neineen is classified as a member of the spinel group, which includes minerals like chromite and magnetite. Its chemical formula is (Mg,Fe)Cr2O4, indicating that it is a chromium spinel with magnesium and iron substituting for each other in the crystal lattice.

The mineral typically forms as an accessory mineral in ultramafic rocks, such as peridotite and serpentinite, which are rich in magnesium and iron. It can also be found in some metamorphic rocks and as a product of hydrothermal alteration. Neineen crystals are usually small, ranging from a few millimeters to a centimeter in size, and they often exhibit a cubic or octahedral shape. The green color of neineen can vary in intensity, ranging from a light green to a deep, almost black shade.

Due to its rarity and distinctive appearance, neineen is sought after by collectors and mineral enthusiasts. It is also used in some industrial applications, such as in the production of refractory materials and as a source of chromium. However, the limited availability and high demand for neineen make it a valuable and expensive mineral in the market. Despite its rarity, neineen remains an interesting and important mineral for both scientific and commercial purposes.