Karttadatumin

Karttadatumin is a rare mineral first discovered in the Eastern Desert of Egypt. Its chemical formula is Fe2(UO2)2(PO4)2(OH)2·10H2O, classifying it as a hydrated uranyl phosphate. The mineral is characterized by its vibrant yellow to greenish-yellow color and often forms small, prismatic crystals. It is typically found in association with other uranium-bearing minerals in pegmatite veins and hydrothermal deposits. The primary elements present in karttadatumin include iron, uranium, phosphorus, and oxygen, along with water molecules.

The crystallography of karttadatumin reveals it to be monoclinic, with distinct crystal habits that can range from acicular to prismatic. Its hardness is relatively low, typically around 2.5 on the Mohs scale, indicating it is a soft mineral. Karttadatumin is also radioactive due to the presence of uranium. Its geological significance lies in its role as an indicator mineral for uranium mineralization and in understanding the complex geochemistry of uranium ore formation. The name "karttadatumin" is derived from the Arabic word for "mine" and the mineral "autunite," reflecting its discovery location and chemical similarities.