They can be located at the following locations:
Chat with our AI personalities
If you are talking about the ones in Lumbridge cave, simply cross over the stepping stones in the middle of the stream where they are.
near clan wars near castle wars in lvl 58wildy in a hotspot in a cave
You can find blurite ore in the cave on the peninsula south of Port Sarim. Look for the ! on the map.
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Using a small net, you can catch these in the underground cave below lumbridge swamp. You can access this area from the lumbridge swamp, or lumbridge castle basement.