conchoidal

conchoidal englanniksi

1. Of or pertaining to a conchoid; that may be defined as a conchoid.

2. (circa), Newton|Isaac Newton, 1976, D. T. Whiteside (editor), ''The Mathematical Papers of Isaac Newton'', Volume 7: 1691-1695, page 621,

(..)a conchoidal hyperbola with an oval at its convexity.

3. Irregular, with planar, concentric curves, similar to those on a mussel shell.

4. 1821, ''Coal'', entry in Andrew Ure, ''A Dictionary of Chemistry on the Basis of Mr Nicholson's'', unnumbered page,

Itpitch-coal is distinguished by its splendent lustre and conchoidal fracture.

5. {{quote-book|en|year=2005|chapter=Chapter 19: Lithic Studies|editors=Herbert D. G. Maschner; Christopher Chippindale|title=Handbook of Archaeological Methods|volume=1|pageurl=http://books.google.com.au/books?id=HC5fG-I020wC&pg=PA719&dq=%22conchoidal%22&hl=en&sa=X&ei=NwapU7nGO8rjkwWezYGICA&redir_esc=yv=onepage&q=%22conchoidal%22&f=false|page=719

6. (quote-text)

7. {{quote-book|en|year=2011|author=David H. Krinsley; John C. Doornkamp|title=Atlas of Quartz Sand Surface Textures|pageurl=http://books.google.com.au/books?id=yzbKMHzYgPsC&pg=PA10&dq=%22conchoidal%22&hl=en&sa=X&ei=NwapU7nGO8rjkwWezYGICA&redir_esc=yv=onepage&q=%22conchoidal%22&f=false|page=10

8. That fractures with planar concentric curves (e.g., as flint, chert or obsidian).

9. 1821, ''Focus of Philosophy, Science and Art'', Volume 1, Issues 1-4, page 74,

The customary transitions of pitchstone are, into Chalcedony, Chert, Semi-opal; also into a substance resembling conchoidal shining jasper, found in clay strata, entangled in trap, or volcanic rock; and lastly, into Trap.