Prehnite 6mm Round AAA Grade - 15-16 Inch hps_07092026 a type of reversible photochromism

a type of reversible photochromism

which occurs in many colors

dainty necklace

red and yellow-orange

Prehnite 6mm Round AAA Grade - 15-16 Inch hps_07092026 a type of reversible photochromismPrehnite 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.