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This is the king of tellurides. The tellurides form a family of binary compounds of the element tellurium (Te) and another element or group. Five tellurides are particularly significant as sources of precious metals.
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Tellurides are easily identified under the blow pipe or by means of a simple wet chemical test. If a material is suspected of being a telluride, a small sample should be ground up and dampened with water to make a small fiat cake (no flux need be added). On the charcoal block, tellurium melts easily, volatilizing in fumes and coating the charcoal block with tellurous acid a short distance from the sample. When the sample is subjected to an oxidizing flame, the charcoal block's coating is white, with a red to dark yellow border. Under the reducing flame, the border disappears in a green flame. If selenium is present, the flame is bluish green. In order to identify tellurides using chemicals, first grind up a piece of the ore about the size of a navy bean, place this in a dry test tube, and add enough strong sulphuric acid with a dropper to cover the sample. If a telluride is present, a reddish violet color will show. The addition of sulphuric acid causes an exothermic reaction (produces heat). Let this cool and then add distilled water to the test sample, drop by drop, until the color disappears; finally, add a few drops of distilled water in excess. A grayish black sediment will precipitate (fall down). This is tellurium.