Pectolite (Larimar)

Pectolites can range in hardness from 4.5 to 5. Compact specimens can even reach 6. Found in the Dominican Republic, compact blue pectolites known as Larimars can take a very high polish. "Larimar Pendant" by Deidre Woollard. Licensed under CC By 2.0.

Article: How to Polish Gems of 4-6 Hardness: Survey Results

Credit: Deidre Woollard