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  2. Tumble finishing - Wikipedia

    en.wikipedia.org/wiki/Tumble_finishing

    A well-chosen speed for stone polishing causes the rocks within the barrel to slide past each other, with the abrasive grit between them. The result of this depends on the coarseness of the abrasive, and the duration of the tumble. Typically, a full tumble polish from rough rock to polish takes 3–5 weeks, and is done in a minimum of 3 steps.

  3. Vibratory finishing - Wikipedia

    en.wikipedia.org/wiki/Vibratory_finishing

    Vibratory tumbler with steel shots polishing small parts. Vibratory finishing is a type of mass finishing manufacturing process used to deburr, radius, descale, burnish, clean, and brighten a large number of relatively small workpieces.

  4. Lithic reduction - Wikipedia

    en.wikipedia.org/wiki/Lithic_reduction

    In archaeology, in particular of the Stone Age, lithic reduction is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts. It has been intensely studied and many archaeological industries are identified almost entirely by the lithic analysis of the precise style of their tools and the ...

  5. Rotten stone - Wikipedia

    en.wikipedia.org/wiki/Rotten_stone

    Rotten stone, sometimes spelled as rottenstone, also known as tripoli, is fine powdered porous rock used as a polishing abrasive for metal smithing, historically for the grinding of optical lenses and in woodworking. It is usually weathered limestone mixed with diatomaceous, amorphous, or crystalline silica.

  6. Lithic flake - Wikipedia

    en.wikipedia.org/wiki/Lithic_flake

    In archaeology, a lithic flake is a "portion of rock removed from an objective piece by percussion or pressure," [1]: 255 and may also be referred to as simply a flake, or collectively as debitage. The objective piece, or the rock being reduced by the removal of flakes, is known as a core .

  7. Stone spheres of Costa Rica - Wikipedia

    en.wikipedia.org/wiki/Stone_spheres_of_Costa_Rica

    They appear to have been made by hammering natural boulders with other rocks, then polishing with sand. The degree of finishing and precision of working varies considerably. The gabbro came from sites in the hills, several kilometres away from where the finished spheres are found, though some unfinished spheres remain in the hills. [citation ...

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  9. Stone carving - Wikipedia

    en.wikipedia.org/wiki/Stone_carving

    Percussion tools for hitting - such as mallets, axes, adzes, bouchards and toothed hammers. Tools for rough shaping of stone, to form a block the size needed for the carving. These include feathers and wedges and pitching tools. Chisels for cutting - such as lettering chisels, points, pitching tools, and claw chisels. Chisels, in turn, may be ...

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