Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch missing The stone's composition remains somewhat

The stone's composition remains somewhat ambiguous

Like other Agates

Aquamarine is a transparent to translucent stone ranging from cerulean blue to light blue in higher grades

Like other forms of jasper it is a power

but is prized

Prehnite Natural 8X10mm Freeform Cut - 15-16 Inch missing The stone's composition remains somewhatPrehnite 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.