Na2CaB5O9OH3

Na2CaB5O9OH3 is a mineral species belonging to the borate group. It is a hydrated sodium calcium borate with the chemical formula Na2CaB5O9(OH)3. The mineral is characterized by the presence of hydroxyl (OH) groups within its crystal structure. It crystallizes in the monoclinic crystal system. Na2CaB5O9OH3 is relatively rare and is typically found in evaporite deposits, particularly in alkaline playa lakes and arid environments where boron-rich solutions are concentrated. Associated minerals can include other borates, carbonates, and halides. Its formation is often linked to the evaporation of brines. The mineral is typically colorless to white, and it can sometimes exhibit a pale pink or yellow hue. It possesses a vitreous luster. In terms of physical properties, it is a relatively soft mineral, with a Mohs hardness typically around 3. It has a specific gravity in the range of 2.2 to 2.3. Due to its rarity and the specific geological conditions required for its formation, Na2CaB5O9OH3 is not of significant economic importance, though it is of interest to mineralogists for its unique chemical composition and crystal structure.