Theoparacelsite is a rare mineral that belongs to the sulfate class of minerals. It is primarily composed of lead, copper, and sulfur, with chemical formula Cu3Pb(AsO4)2(SO4)(OH)2. The mineral derives its name from the combination of the Greek word "theos," meaning god, and the name of the Swiss alchemist and physician Paracelsus.
Theoparacelsite typically forms in the oxidized zone of lead and copper-rich hydrothermal deposits. It occurs as small, translucent to transparent prismatic crystals or as grainy aggregates. The crystal structure of theoparacelsite is orthorhombic, meaning it possesses three mutually perpendicular axes of different lengths.
The mineral frequently exhibits a yellow to greenish-yellow coloration, often with a vitreous to pearly luster on crystal surfaces. It has a Mohs hardness of approximately 2.5 to 3, indicating a relatively low scratch resistance. The specific gravity of theoparacelsite ranges around 5.9.
Due to its scarcity and limited occurrences, theoparacelsite has limited practical uses. However, it is considered a valuable specimen among mineral collectors and enthusiasts. Its intricate crystal formations, vibrant coloration, and association with notable historical figures such as Paracelsus make it desirable for display and study purposes.
While the mineral itself may not hold significant industrial importance, its unique composition and formation provide valuable insights into the geological processes and conditions that contribute to the formation of hydrothermal mineral deposits.
