Beads, Amazonite (natural), 6.5-8mm smooth roundel, A grade, Mohs hardness 6 to 6.5. Sold per 16-inch strand Amazonite, is also known as Amazon stone and it is known for semi-opaque blue-green color shades. It is Formed from a variety of microcline feldspar, amazonite can also range from light green to greenish blue to deep blue-green shade. It may include milky white and tan cloudiness or streaking.