Amazonite Stone Cube | 8x8mm | Blue White | 2 Bead(s)Blue White Amazonite Cube Beads for Jewelry Making These unique cube Amazonite beads are perfect for earrings. Amazonite, also known as Amazonstone,[4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline.[4][5] Its chemical formula is KAlSi3O8,[1][6] which is polymorphic to orthoclase. Its name is taken from that of the Amazon River, from which green stones were formerly obtained, though it is unknown whether those