survival question: how do you make a knife, if you are stranded in the jungle, or an island?

Q: I am writing a survival book and had just started planning the "hunting" chapter, and then thought, what if you need to hunt, or make things when you are stranded, but dont have a knife? what (from the forest, jungle, island, etc.) would you make it from and how? if any one has a step vy step guide that would be great. thanks x PS: sorry if this annoys u but i didnt know which category to put it in.

A: In the absence of metal rock usually has the best knife like qualities. Selecting the proper rock for this purpose is difficult. What you are looking for is rocks that are made from silica (glass). When broken rocks made up of silica leave sharp edges like shards of glass. The goal is to select an irregular shaped rock to break (e.g. longer flatter rocks are easier to break, so the more a rock deviates from a sphere the easier it will be to break) that is not to large, ideal would be double fist sized and smaller. Use a hard surface like another rock as your base and finally a third rock to do your smashing. Once broken chose a shard with the best potential "knife" shape and then again use other rocks this time just to chip at it for better shape. I recommend sticking with a bare stone handle to begin with. If that is not possible due to sharp edges, the bark of many small shrubs can be stripped in strips and used as a basic rope to wrap around the handle to avoid cuts. Remember to avoid injury. In the absence of medical care (eg antibiotics) it is important to avoid cuts and scrapes as much as possible.

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