Prehnite 12x16-18x25mm Jagged Rough Collar 4mm calcium and aluminum with trace

calcium and aluminum with trace amounts of iron

or merlinite

Russia and Brazil

Blue Apatite ranges in color from light teal-blue to bright blue to dark blue-green

Prehnite 12x16-18x25mm Jagged Rough Collar 4mm calcium and aluminum with tracePrehnite 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.