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- Q2747476 subject Q6960098.
- Q2747476 subject Q7145188.
- Q2747476 subject Q7153706.
- Q2747476 subject Q8598885.
- Q2747476 abstract "Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation. Materials that break in this way include quartz, flint, quartzite, jasper and other fine-grained or amorphous materials with a composition of pure silica, 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.".
- Q2747476 thumbnail Lipari-Obsidienne_(5).jpg?width=300.
- Q2747476 wikiPageWikiLink Q103382.
- Q2747476 wikiPageWikiLink Q107400.
- Q2747476 wikiPageWikiLink Q1121708.
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- Q2747476 wikiPageWikiLink Q15735642.
- Q2747476 wikiPageWikiLink Q201175.
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- Q2747476 wikiPageWikiLink Q3268495.
- Q2747476 wikiPageWikiLink Q332028.
- Q2747476 wikiPageWikiLink Q43010.
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- Q2747476 wikiPageWikiLink Q4590598.
- Q2747476 wikiPageWikiLink Q479257.
- Q2747476 wikiPageWikiLink Q5120022.
- Q2747476 wikiPageWikiLink Q53754.
- Q2747476 wikiPageWikiLink Q6960098.
- Q2747476 wikiPageWikiLink Q7145188.
- Q2747476 wikiPageWikiLink Q7153706.
- Q2747476 wikiPageWikiLink Q83087.
- Q2747476 wikiPageWikiLink Q83437.
- Q2747476 wikiPageWikiLink Q8598885.
- Q2747476 wikiPageWikiLink Q898288.
- Q2747476 wikiPageWikiLink Q899604.
- Q2747476 comment "Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation. Materials that break in this way include quartz, flint, quartzite, jasper and other fine-grained or amorphous materials with a composition of pure silica, such as obsidian and window glass.Conchoidal fractures can also occur in other materials under favorable circumstances.".
- Q2747476 label "Conchoidal fracture".
- Q2747476 depiction Lipari-Obsidienne_(5).jpg.