Nelvine

Nelvine is the Realms name for a variety of feldspar called albite which was found in large quantities in older rock formations. The gem quality version of this mineral has a blue iridescent flash known as peristerism. Nelvine is soft enough to be easily cut with even crude tools, but it was too fragile for fine detail work. The base stone is usually white, cream, fawn, or brownish pink and was therefore sometimes called "pigeon stone". A typical specimen had a base value of 10 gp.