1. Raw materials

2. Manufacture

3. See also

4. References

Raw materials

Some types of raw materials are:

• Agate
• Basalt
• Chalcedony
• Chert
• Diorite
• Flint
• Greenstone
• Jadeite
• Jasper
• Obsidian
• Onyx
• Quartz
• Quartzite
• Sandstone
• Schist
• Silcrete

These raw materials all have common characteristics which make them ideal for stone tool production. To make a stone material ideal for tool production, it must be non-crystalline or glassy, which allows for conchoidal fracturing. These characteristics allow the person forming the stone ("flintknapper") to control the reduction precisely in order to make a wide variety of tools.

There are numerous factors as to why some raw materials would be chosen over others and can result in the use of low quality materials. A few examples of such factors include the availability of materials, the proximity to materials, and the quality of materials. To help understand this, archaeologists have applied models of risk management to stone artifacts. Theories have suggested that in times of high risk, more effort will be put into acquiring high quality material that is more reliable and can be maintained over longer periods of time. In times of low risk, lower quality materials may be acquired from closer sources.^[3] However, Mackay and Marwick (2011) found that this pattern does not always hold true in their application of this theory to the South African Pleistocene record.^[4] They then used computer simulations to understand why the relationship between the time put into producing technology and subsistence acquisition would produce the patterns they saw. Mackay and Marwick found that when less time was put into acquiring material for and producing technology, that extra time increased the chances of encounters and thus increases the chances of acquiring more resources in a shorter period of time. This demonstrates that raw material choice is not always straightforward, nor are high quality materials always sought out.^[5]

Manufacture

Stone tools are manufactured using a process known as lithic reduction. The technique used is dependent upon the level of detail required for the desired tool. The technique with the least detail is conducted using a hammerstone, in which a hard rock (often sandstone) is struck against the raw material in order to chip off large flakes, and begin to shape the stone. Using a hammerstone produces what is known as a preform, which is the core of the tool in need of more detailed refinements. The next technique allows for an increased level of detail; using a soft hammer (often made of wood or bone), one can chip away flakes of material with more precision. The most precise technique is known as pressure flaking. This technique involves pressing small flakes off rather than by means of percussion. Bone and antlers are often used as punches in order to create a very precisely detailed tool. Another technique, known as indirect percussion, combines the use of a punch and a hammer in order to apply pressure to a precise area of the stone. For the most part, stone cores can only be used to a certain extent before they become exhausted cores. As such, it is typically the flakes, or debitage, that are the basis for stone tools. The flakes are shaped using the lithic reduction techniques, allowing for creation of various tools such as arrowheads and handaxes.

Two stone characteristics will determine whether one is able to chip away big enough flakes to make tools out of: whether the stone is of a cryptocrystalline structure, and how conchoidally the stone fractures. A cryptocrystalline stone is one that is made up of minute crystals that can only be seen with a microscope. Conchoidal fractures are described as smooth, curved breaks from the base stone. Stones that have both of these characteristics allow for flakes that are big and sharp enough for a variety of tools to be made. Obsidian is a great example of a material that is perfect for making tools with, as it is both cryptocrystalline and it fractures conchoidally. Many early Middle Eastern and American civilizations used obsidian as a basis for tools as its internal structure made it easier to chip away than most of the other stones in the area.

During an experiment conducted by Dibble and Whittaker, they found that even the angle hit at the exterior platform would produce different flake types. The exterior platform angle is an angle formed by hitting the intersection of the platform surface and the exterior of the core. When hitting the core at a low exterior platform angle, a feather termination is produced. When the exterior platform angle is hit near a mid-range to low angle, a hinge termination is produced. The highest exterior platforms produce the overshoots. The desired termination, however, is generally the feather termination due to its sharp edge.^[6]

See also

• Knapping
• Experimental archaeology

References

• Nads
• NaDS
• Nadsat
• Nadson
• Nad Tatra blýska
• Nad tatrou sa blyska
• Nad Tatrou sa blyska
• Nad Tatrou sa blyská
• Nad Tatrou sa blýska
• Nadurveni vuglishta
• Nadutheervai Ula
• Nadvirna
• Nadvorna (Hasidic dynasty)
• Nadvornaya
• Nadwirna
• Nadworna
• Nadya Rusheva
• Nadym
• Nadym River
• Nae Caranfil
• Nae caranfil
• Naeemuddin
• Naegele's rule
• Naegele's Rule
• Naegleria