Conchoidal vs Chalcedony - What's the difference?
conchoidal | chalcedony |
(mathematics) Of or pertaining to a conchoid; that may be defined as a conchoid.
* , 1976, D. T. Whiteside (editor), The Mathematical Papers of Isaac Newton , Volume 7: 1691-1695,
(mineralogy, of a fracture) Irregular, with planar, concentric curves, similar to those on a mussel shell.
* 1821 , Coal'', entry in Andrew Ure, ''A Dictionary of Chemistry on the Basis of Mr Nicholson's ,
* 2005 , Chapter 19: Lithic Studies'', Herbert D. G. Maschner, Christopher Chippindale (editors), ''Handbook of Archaeological Methods , Volume 1,
* 2011 , Robert C Shaler, Crime Scene Forensics: A Scientific Method Approach ,
* 2011 , David H. Krinsley, John C. Doornkamp, Atlas of Quartz Sand Surface Textures ,
(mineralogy, of a mineral ) That fractures with planar concentric curves (e.g., as flint, chert or obsidian).
* 1821 , Focus of Philosophy, Science and Art , Volume 1, Issues 1-4,
A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.
*{{quote-magazine, date=2012-03
, author=Lee A. Groat
, title=Gemstones
, volume=100, issue=2, page=128
, magazine=(American Scientist)
As an adjective conchoidal
is of or pertaining to a conchoid; that may be defined as a conchoid.As a noun chalcedony is
a form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.conchoidal
English
(Conchoidal fracture)Adjective
(en adjective)page 621,
- a conchoidal hyperbola with an oval at its convexity.
unnumbered page,
- It[pitch-coal] is distinguished by its splendent lustre and conchoidal fracture.
page 719,
- Some flakes detached in a controlled manner have characteristics of conchoidal fracture.
page 479,
- On one side of the radial edge, the conchoidal fractures form right angles, that is, form a perpendicular with the edge.
page 10,
- If grains derived from these rocks are unweathered after separation from the parent rock (a very rare occurrence), they may contain either conchoidal breakage patterns if grains are large, or upturned plates and flat upper and lower surfaces if small grains are considered.
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.
chalcedony
English
Noun
(chalcedonies)citation, passage=Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony , garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)}}
