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This product is green powder, hexagonal crystal system. Density 5.21g/cm3 Mohs hardness 8.5-9 (close to corundum and silicon carbide, second only to diamond) refractive index 2.5, specific heat capacity (20?) /0.17/g·K. Insoluble in water, acid and organic solvents, slightly soluble in concentrated sodium hydroxide solution, soluble in hot sodium bromate solution, hot concentrated perchloric acid solution or boiling thiophosphate mixed acid. In case of heat stability, melting point 2265?, boiling point about 3000?, is a high-quality refractory material. Extremely stable to light, large gas (etc.), excellent weather resistance. Metallic luster, magnetic, strong hiding power, high temperature resistance, light resistance, acid and alkali resistance, stable in the atmosphere, with excellent outstanding pigment quality and fastness.link:http://www.polishingmarket.com