Our magnesium fluoride has one category: crystal. The produt in this picture is crystal granule. Applied in: Multi-layer coating; AR coating; Decorative coating; Glasses coating; UV coating We follow critical manufacture standards, quality assurance, welcome your consultation! Specifications Summary: MgF2 Magnesium fluoride (Chemical formula: MgF2) 1.crystal granule: 1-3mm; 3-5mm 2.color: colorless transparent 3.purity:99.99% 4.package: 1kg/bag 5.storage: avoid exposure to sunlight &acid keep dry Magnesium fluoride properties: 1.cas no.: 7783-40-6 2.density(g/cm3): 3.18 3.melting point(â??): 1266 4.refractive index at 550nm: 1.38 5.transparency range(μm): 0.11~10 6.evaporation source: B(W, Ta, Mo) 7.application: Multi-layer coating: AR coating; Decorative coating; Glasses coating; UV coating