Serafinite from Russia, in silver "Prestige" pendants (925/000 silver)

The mineral Clinochlor (also called Penninite / Serafinite) is a phyllosilicate with the chemical formula (Mg, Fe2 +) 5Al (Si3Al) O10 (OH) 8. It is considered to be the magnesium-containing end member of the chlorite group, part of the micas. The dark to olive green, blue-green or white clinochlor has a glass to pearl luster and a white stripe color. The cleavage is perfect according to crystal plane and the crystal system is monoclinic. The average density is 2.65 and the hardness is 2 to 2.5. Clinochlor is not radioactive. Clinochlor is named after the Greek words clinos, "oblique" and chloros, "green". The synonym penninite is named after the Apennines in Italy. Like other chlorite minerals, clinochlor is mainly found in slightly metamorphic rocks. It is a typical mineral in metamorphosed mafic rocks.