MEASUREMENTS: 1 - 25-35 pcs / Lb. This listing is for your choice of one stone to 25 lb. Lots of the tumbled gemmy Amazonite pictured from Brazil.AMAZONITE PROPERTIES: Amazonite is a green variety of microcline feldspar. The name is taken from that of the Amazon River, from which certain green stones were formerly obtained, but it is doubtful whether green feldspar occurs in the Amazon area. Because of its bright green color when polished, amazonite is sometimes cut and used as a gemstone, although it is easily fractured. For many years, the source of amazonite's color was a mystery.
Naturally, many people assumed the color was due to copper because copper compounds often have blue and green colors. More recent studies suggest that the blue-green color results from small quantities of lead and water in the feldspar. Category: Tectosilicate Formula: KAlSi3O8 Crystal system: Triclinic Color: Green, blue-green Crystal habit: Prismatic Cleavage: Perfect Fracture: Uneven, splintery Tenacity: Brittle Mohs hardness: 6-6.5 Luster: Vitreous Streak: White Diaphaneity: Translucent, opaque Specific gravity: 2.56-2.58 Refractive index: 1.522-1.530 Birefringence: -0.008 Pleochroism: Absent UV fluorescence: Weak; olive-green Courtesy of Wikipedia.