Prehnite with Rutilate 4mm Round - 15-16 Inch July Chiastolite is also known as

Chiastolite is also known as the Cross Stone for the cross matrices of browns

gray and black

Rocky Butte Jasper strands are predominantly shades of gray

A Manganese inosilicate (or chain silicate)

Rhodonite belongs to the Pyroxenoid group of minerals

Prehnite with Rutilate 4mm Round - 15-16 Inch July Chiastolite is also known asPrehnite 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.