The tanzanite fang is obtained from killing Zulrah. It can be used with a chisel to create the toxic blowpipe, requiring level 53 Fletching and granting 120 Fletching experience.
Players can dismantle the fang to receive 20,000 Zulrah's scales, resulting in a profit of 3,789 coins.
For an exhaustive list of all known sources for this item, see here
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- Tanzanite is a variety of the mineral zoisite, and is only found in the Mererani Hills in Northern Tanzania. The colour of the fang reflects the colour of the actual mineral.