rough grinding stone

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• Stone carving — is an ancient activity where pieces of rough natural stone are shaped by the controlled removal of stone. Owing to the permanence of the material, evidence can be found that even the earliest societies indulged in some form of stone work.Work… …   Wikipedia

• Stone tool — A stone tool is, in the most general sense, any tool made of stone. Although stone tool dependent cultures exist even today, most stone tools are associated with prehistoric societies that no longer exist.The study of stone tools is often called… …   Wikipedia

• Grinding (abrasive cutting) — Sketch of how abrasive particles in a grinding wheel remove material from a workpiece. Grinding is an abrasive machining process that uses a grinding wheel as the cutting tool. A wide variety of machines are used for grinding: Hand cranked knife… …   Wikipedia

• stone — {{Roman}}I.{{/Roman}} noun 1 hard solid substance ADJECTIVE ▪ heavy ▪ hard ▪ rough, smooth ▪ weathered ▪ carve …   Collocations dictionary

• Stone Drums of Qin — The Stone Drums of Qín (zh cw|c=秦石鼓|w= Ch in Shih Ku ) are ten granite boulders bearing the oldest known stone inscriptions in ancient Chinese (much older inscriptions on pottery, bronzes and the oracle bones exist). Because these inscribed… …   Wikipedia

• Quern-stone — The upper stone of a Scottish hand quern from Dalgarven Mill, North Ayrshire. Quern stones are stone tools for hand grinding a wide variety of materials. They were used in pairs. The lower, stationary, stone is called a quern, whilst the upper,… …   Wikipedia

• Sharpening stone — Waterstone redirects here. For the British bookstore chain, see Waterstone s. An oil stone Sharpening stones, water stones or whetstones are used to grind and hone the edges of steel tools and implements. Examples of items that may be sharpened… …   Wikipedia

• Surface grinding — is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or non metallic substance from a workpiece, making a… …   Wikipedia

• Petoskey stone — A Petoskey stone is a rock and a fossil, often pebble shaped, that is composed of a fossilized coral, Hexagonaria percarinata . The stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off …   Wikipedia

• Tool stone — In archaeology, a tool stone is a type of stone that is used to manufacture stone tools. Generally speaking, tools that require a sharp edge are made using cryptocrystalline materials that fracture in an easily controlled conchoidal manner.… …   Wikipedia

• Ometepe (archaeological site) — Ometepe Island is an important archaeological site, located in the Lake Nicaragua in the Republic of Nicaragua, administratively belongs to the Rivas Department. Its name derives from the Nahuatl words ome (two) and tepetl (mountain), meaning two …   Wikipedia