Krebsit

Krebsit is a rare mineral classified as a phosphate mineral, with the chemical formula Ni3(PO4)2·8H2O. It is a hydrated nickel phosphate that forms as a secondary mineral in oxidized zones of nickel deposits. The mineral was first discovered in the Kheops deposit in South Africa, which is a well-known nickel ore mineralization site.

Krebsit typically exhibits a vibrant green coloration due to its nickel content. It commonly occurs as foliated or fibrous masses, and its crystals are often prismatic but are generally small and not well-formed. The mineral has a monoclinic crystal system and a vitreous to silky luster. Its Mohs hardness is approximately 2.5 to 3, making it relatively soft, and it has a specific gravity of around 2.56.

In terms of occurrence, krebsit is found in weathered or altered nickel sulfide ores, frequently associated with other secondary minerals such as heterogenite, niwottite, and various other phosphates and oxides. Its identification is primarily through optical microscopy and chemical analysis, as it bears similar features to other nickel phosphates.

Krebsit holds limited industrial significance but is valued among mineral collectors for its distinctive color and crystal form. Its study provides insights into mineralogy related to nickel deposits and the geochemical conditions that lead to phosphate mineralization in such environments. Due to its rarity, krebsit remains a mineral of interest primarily for scientific research and mineral collection purposes.