This is an outstanding matrix specimen of pentagonite. A 2.5cm tall pentagonite "Christmas tree" composed of acicular, transparent, teal blue crystals radiate away from the "trunk". Small mounds of tiny, glistening stilbite crystals are the backdrop for the cavansite. Sprays of Pentagonite are known for their spectacular form, color, and luster. Pentagonite is a hydrated vanadium-bearing calcium silicate. Once again, the world