Prehnite 6mm Round AAA Grade - 15-16 Inch Calligraphy Stone and it has been used

and it has been used throughout history for various purposes

Fancy Jasper

is desired by some collectors as proof of a natural stone

Rocky Butte Jasper strands are predominantly shades of gray

Prehnite 6mm Round AAA Grade - 15-16 Inch Calligraphy Stone and it has been usedPrehnite 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.