How is plagioclase feldspar different from orthoclase feldspar?
Simply so, what is the main difference between orthoclase feldspar and plagioclase feldspar?
Plagioclase feldspars lack potassium, are light colored and are usually striated. The other k-spar minerals are sanidine, microcline and anorthoclase . Orthoclase is the more common of the k-spars. The differences between these minerals are minor in hand samples.
Subsequently, question is, what is the most common element found in orthoclase feldspar but not in plagioclase feldspar? It is the proportions of these 3 elements which help determine which specific feldspar is formed. The feldspars are divided into 2 broad categories: plagioclase, which contains calcium and sodium; and orthoclase, which contains potassium.
Correspondingly, is plagioclase a feldspar?
Plagioclase is a member of the feldspar group (like orthoclase) and is a framework silicate. Plagioclase consists of a solid solution between the albite and anorthite end-members, and together with quartz is the most common of the rock forming minerals.
What are the two types of feldspar?
The feldspars are divided into two main groups: Potassium feldspar ("K-spar") and plagioclase ("plag").