Synthesis of Gem Quality Diopside by the Floating Zone Method, using Natural Chromian Diopside

Abstract

Using green but opaque natural chromian diopside from Kamisano, Yamanashi Prefecture as nutrient and seed, transparent, emerald green single crystal boules of gem quality have been synthesized by the floating zone method. The syntheses were carried out by the travelling solvent floating zone method, using an IR convergent image furnace in nitrogen atmosphere. Nutrient rods of 1.5cm in length and 0.5cm φ were prepared by hydrostatically pressing the powders of natural samples. The conditions of growth and microscopic observations of the products are described.