Paraskoliasite

Paraskoliasite is a rare mineral species discovered in 1998. It is a calcium aluminum sulfate hydroxide mineral with the chemical formula CaAl2(SO4)2(OH)6. The mineral was named after the Greek word "paraskolias," which means "to accompany," reflecting its association with the mineral skoliasite. Paraskoliasite is typically found in the oxidation zone of aluminum-rich deposits, often in association with other secondary minerals such as skoliasite, alunite, and gypsum. It forms as a result of the alteration of primary aluminum minerals in the presence of sulfuric acid, which is often generated by the oxidation of sulfide minerals.

Paraskoliasite crystals are typically small, ranging from a few millimeters to a few centimeters in size. They are usually found in the form of tabular or prismatic crystals, and can be colorless, white, or light gray. The mineral has a Mohs hardness of approximately 3.5 and a specific gravity of around 2.7. It exhibits a perfect cleavage in one direction and has a vitreous to pearly luster. Paraskoliasite is not known to have any significant economic value, but it is of interest to mineral collectors and researchers due to its rarity and unique chemical composition. The mineral's discovery has contributed to a better understanding of the complex processes involved in the alteration of aluminum-rich deposits.