Chalcopyrite Chalcopyrite Chalcopyrite ( ) is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical formula CuFeS. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green tinged black. On exposure to air, chalcopyrite oxidises to a variety of oxides, hydroxides and sulfates. Associated copper minerals include the sulfides bornite (CuFeS), chalcocite (CuS), covellite (CuS), digenite (CuS); carbonates such as malachite and azurite, and rarely oxides such as cuprite (CuO). Chalcopyrite is rarely found in association with native copper. Natural
Ore Raththam Ore Raththam Ore Raththam () is a 1987 Indian Tamil-language film directed by Swarnam and written by M. Karunanidhi. The film stars Karthik, BhagyalakshmiMadhuri, Kishmu, Manorama, Pandian, Seetha, M. K. Stalin and Radha Ravi. It is based on Karunanidhi's story of the same name, which was serialised in the magazine "Kungumam". "Ore Raththam" was a story which was serialised in the magazine "Kungumam". The author M. Karunanidhi adapted it for the screen with the same title. His son Stalin made his cinematic acting debut with this film. The soundtrack was composed by Devendran. "Ore Raththam" was released on 8 May