Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch Size_20mm Howlite can be easily dyed

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

as well as brown to reddish brown or red in color

It can be colorless

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

” the Latin word for copper

Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch Size_20mm Howlite can be easily dyedPrehnite 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.