Feldspar is one of the most common rock forming minerals and is present in most rocks. It is further broken down into two main groups : K-feldspar and plagioclase feldspar. These groups are both solid solution series. K-feldspar consist of some proportion of sodium and potassium, while plagioclase feldspars have some ratio of sodium and calcium. The structure of K-feldspars are very responsive to temperature and pressure and there are several different members of the group.
Labradorite blazes Sold Out
Gem grade moon stone slice Sold Out
Adularia Sold Out
Adularia Sold Out
Graphic granite, Finland Sold Out
Rainbow moonstone tumblestone Sold Out
