Prehnite is a hydrated calcium aluminosilicate. The name was assigned in 1788 by Abraham Gottlieb Werner in honor of the Dutch colonel Hendrik Von Prehn. Its color varies from green to greenish-yellow. In nature it can be found in the form of tabular and prismatic crystals or more commonly as a patina on top of rocks.
Dimensions
Height (cm): 2.5
Depth (cm): 2.5
Width (cm): 3.5
Weight (g): 30-40
Property
Chemical Formula: Ca2Al2Si3O10 (OH) 2
Mohs scale: 6-6.5
Relative Density: 2.8-3
Crystalline System: Orthorhombic
