Zarbrina

Zarbrina was the name given in the Realms to cerussite, an extremely soft lead-like mineral, colorless and easily cut into brilliant faceted gems.

Description
Due to its softness, this ornamental stone was often used in ceremonial or little-used jewelry, or set in small protective metal claw mounts on sleeves or collar-hems of gowns. Because it felt soapy to the touch, small zarbrina stones could be used on fancy intimate apparel or sewn into bed linens without causing discomfort. A typical stone had a base value of 10 gp.

Powers
Powdered zarbrina could be used as an ingredient for magical ink when dealing with illusion magic.