Prehnite with Rutilate 8mm Round - 15-16 Inch Size_4x4-8mm They are all varieties of

They are all varieties of the mineral corundum

brown or orange organic gem

meaning it becomes magnetically charged from heat or friction

Garnet was used as far back as the Bronze Age

Whether you are a collector of cool rocks or are in awe of its beauty

Prehnite with Rutilate 8mm Round - 15-16 Inch Size_4x4-8mm They are all varieties 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.