Prehnite 6x10mm Handcut Faceted Nugget Bead - 15-16 Inch Throat It is quite hard

It is quite hard

or polished

manganese and other metallic oxides captured during the forming of the rock

Afghanite is said to enhance spiritual clarity and insight

These jump rings are made of a brass core with precious metal plating

Prehnite 6x10mm Handcut Faceted Nugget Bead - 15-16 Inch Throat It is quite hardPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.