Feldspar is a group of minerals which comprises a number of species with varying degrees of isomorphism. Feldspars are subdivided into two sub group, potassium feldspars (orthoclase, microcline) and plagioclase feldspar.
Of gem interest are orthoclase, microcline and plagioclase (albite, labradorite and oligoclase).
Leave a Reply
You must be logged in to post a comment.