The mosque also has a 265 m (869 ft) tall minaret, which makes it the tallest building in Africa.[8] It also houses an observation deck atop the minaret, which has 37 floors. The mosque is designed to withstand an earthquake of magnitude 9.0 and the structure has been specially processed to resist corrosion. The main prayer hall has 618 octagonal columns serving as support pillars and 6 km (3.7 mi) of calligraphic writing engraved with a laser system. The dome of the prayer hall has a diameter of 50 m (160 ft) and rises to a height of 70 m.
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