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Plastic cover with knob
the meter will give an alarm when the measured value exceeds limits
Bergeon 6111D
1 * Boring Bar
Mains operation
7.40ct Greenish Sapphire Oval Cabochon Slice 15.9x11.7mm Horotec 07.116 Set of 13 dies Plastic cover with knobSapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur. The variety in colours is due to trace amounts of elements such as iron, titanium, chromium, copper and magnesium. Mohs Scale of Hardness: 9 (out of 10). Sources: Mines that have yielded the finest sapphires in colour and clarity are located in Kashmir, Myanmar and Sri Lanka. Nowadays the main sources of sapphires are:
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