Pentagonite (rare)

Item Description

Pentagonite is one of those species that nearly everybody knows, but it really only found in one place in the world in any quantity. Interestingly, although virtually every specimen of Pentagonite you'll see on the market is from India, the type locality is the Owyhee Dam in Oregon. The species gets its name from the five-fold habit shape of the twinned crystals. The mineral is commonly found with Cavansite because the species are dimorphous (sharing the shame chemistry, but having different crystal forms). It has been suggested that Cavansite is a low-temperature form and Pentagonite a high-temperature form of their respective species. This piece features exceptionally fine quality, electric blue color crystal "sprays" of Pentagonite measuring up to 1.2 cm across sitting beautifully atop bladed silvery-white Heulandite on basalt matrix. Excellent quality all around, and very showy due to the three-dimensional nature of the piece. Valued at $950 in the inventory.