Nelvine

Nelvine is a variety of feldspar called albite 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 is also fragile and is not good for fine detail work. The base stone is usually white, cream, fawn, or brownish pink and is therefore sometimes called "pigeon stone". A typical specimen has a base value of 10gp.