Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch Size_20mm It is found in the

It is found in the Bilk Mountain range near Denio

Malachite was used extensively as decoration in the palaces of Russian tsars and forms the columns of St

The stone's composition remains somewhat ambiguous

Norway where this type of igneous rock is found

Howlite can be easily dyed and is often treated to be blue for use as a substitute for turquoise

Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch Size_20mm It is found in thePrehnite 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.