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• Conchoidal_fracture abstract "Conchoidal fracture describes the way that brittle materials break when they do not follow any natural planes of separation. Materials that break in this way include flint, quartzite, and other fine-grained or amorphous materials with a composition of pure silicate, such as obsidian and window glass. Conchoidal fractures can also occur in other materials under favorable circumstances. This material property was widely used in the Stone Age to make sharp tools, and minerals that fractured in this fashion were widely traded as a desirable raw material.Conchoidal fractures often result in a curved breakage surface that resembles the rippling, gradual curves of a mussel shell; the word "conchoid" is derived from the word for this animal (Greek konche). A swelling appears at the point of impact called the bulb of percussion. Shock waves emanating outwards from this point leave their mark on the stone as ripples. Other conchoidal features include small fissures emanating from the bulb of percussion.They are defined in contrast to the faceted fractures often seen in single crystals such as semiconductor wafers and gemstones, and the high-energy ductile fracture surfaces desirable in most structural applications. See the main article on Fracture.".
• Conchoidal_fracture thumbnail Lipari-Obsidienne_(5).jpg?width=300.
• Conchoidal_fracture wikiPageID "427862".
• Conchoidal_fracture wikiPageRevisionID "605890389".
• Conchoidal_fracture hasPhotoCollection Conchoidal_fracture.
• Conchoidal_fracture subject Category:Lithics.
• Conchoidal_fracture subject Category:Materials_degradation.
• Conchoidal_fracture subject Category:Mineralogy.
• Conchoidal_fracture subject Category:Stone_Age.
• Conchoidal_fracture comment "Conchoidal fracture describes the way that brittle materials break when they do not follow any natural planes of separation. Materials that break in this way include flint, quartzite, and other fine-grained or amorphous materials with a composition of pure silicate, such as obsidian and window glass. Conchoidal fractures can also occur in other materials under favorable circumstances.".
• Conchoidal_fracture label "Cassure conchoïdale".
• Conchoidal_fracture label "Conchoidal fracture".
• Conchoidal_fracture label "Fractura concoidea".
• Conchoidal_fracture label "Fratura concoide".
• Conchoidal_fracture sameAs Konchoidální_lom.
• Conchoidal_fracture sameAs Fractura_concoidea.
• Conchoidal_fracture sameAs Cassure_conchoïdale.
• Conchoidal_fracture sameAs Fratura_concoide.
• Conchoidal_fracture sameAs m.0278jn.
• Conchoidal_fracture sameAs Q2747476.
• Conchoidal_fracture sameAs Q2747476.
• Conchoidal_fracture wasDerivedFrom Conchoidal_fracture?oldid=605890389.
• Conchoidal_fracture depiction Lipari-Obsidienne_(5).jpg.
• Conchoidal_fracture isPrimaryTopicOf Conchoidal_fracture.