Prehnite Natural 6-7mm Table Cut Cube A Grade - 15-16 Inch hps_05232024 It is often thought of

It is often thought of as an all-black stone

it is cut and polished to look just like a Quartz gemstone

Moroccan Agate occurs in striking colors of red

Red Botswana Agate displays highly defined parallel banding

Prehnite Natural 6-7mm Table Cut Cube A Grade - 15-16 Inch hps_05232024 It is often thought ofPrehnite 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.