SULPHUR
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Sulphur, which is given a bad reputation because of its odour, can make a very beautiful mineral specimen, and fine quality examples are much sought after. The unmistakable deep yellow colour is not matched by any other mineral and the nicely shaped crystal forms of sulphur add to its attractiveness. As for the odour, this occurs when water mixes with the sulphur and a small amount of hydrogen sulphide (H2S) gas is produced. Although only small amounts of H2S form from just moisture in the air, it is a powerful odour producer and is the dominating contributor to the odour of rotten eggs. Rest assured, though, that most specimens of sulphur, when kept dry, do not emit a strong odour and this is not difficult for collectors of fine sulphur specimens to ensure. Hardness: 1.5-2.5. Other characteristics.
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