Sunday, August 18, 2013

Here's How To... Make An Arrowhead

Flint-knapping requires the ability to control the way rocks break when they are struck. The best rock is somewhat brittle and uniform in texture and structure, lacking frost fractures, inclusions, or other flaws. This type of rock is very fine grained or non-grained. The best rocks for flint-knapping are chert, flint, chalcedony, quartzite, jasper, and obsidian. These rock types, when struck with another rock, piece of antler, or bone, will fracture or break in a characteristic pattern called a conchoidal fracture. This creates a rock fragment called a flake.

The production process begins with a piece of raw material, called a core. Flakes are removed by striking the edge of the core with a sharp, forceful blow, in what is called percussion flaking.

Percussion flakes are removed using a hard hammer or soft hammer. Hard hammers are typically made of igneous or metamorphic rocks such as granite, quartz, basalt, or gneiss. Hard hammers tend to pass most of their energy to the core without absorbing much of the force, so they are used to flake large cores of hard materials. A carefully controlled strike is always more important than a hard strike when using a hard hammer.

Follow the link to... Make an Arrowhead




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