Tags: Chemical Substance, Mineral.
Pinalite is a rare lead tungstate–chloride mineral with formula: Pb3WO5Cl2. Pinalite crystallizes in the orthorhombic crystal system. The orthorhombic system is described as having three crystallographic axes of unequal lengths normally referred to as c (the longest axes) b (the second longest axes) and a (the smallest axes). These axes all have corresponding angles of 90 degrees. Pinalite belongs to the biaxial optical class and is negative.