Difference between revisions of "Chert"
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[[File:36.2297-CR9383-d1.jpg|thumb|Cubic weights<br>MFA3 36.2297]] | [[File:36.2297-CR9383-d1.jpg|thumb|Cubic weights<br>MFA3 36.2297]] | ||
== Description == | == Description == | ||
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An opaque, white to light-gray, fine-grain stone containing microcrystalline [[quartz]] particles. Chert is similar in composition to [[flint]], but has a lighter color. It was used in Paleolithic and Neolithic times for tools, weapons, and vessels. Currently, chert is used as an [[abrasive]], a semiprecious [[stone]], and as an [[aggregate]] for the construction of buildings and roads. | An opaque, white to light-gray, fine-grain stone containing microcrystalline [[quartz]] particles. Chert is similar in composition to [[flint]], but has a lighter color. It was used in Paleolithic and Neolithic times for tools, weapons, and vessels. Currently, chert is used as an [[abrasive]], a semiprecious [[stone]], and as an [[aggregate]] for the construction of buildings and roads. | ||
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* Fracture = conchoidal | * Fracture = conchoidal | ||
* Mohs Hardness = 7.0 | * Mohs Hardness = 7.0 | ||
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[[File:Chert_near.Eureka.jpg|thumb|Chert near Eureka Lake spillway]] | [[File:Chert_near.Eureka.jpg|thumb|Chert near Eureka Lake spillway]] | ||
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[[media:download_file_191.pdf|Properties of Common Abrasives]] | [[media:download_file_191.pdf|Properties of Common Abrasives]] | ||
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==Resources and Citations== | ==Resources and Citations== | ||
Latest revision as of 12:49, 28 May 2022
Description
An opaque, white to light-gray, fine-grain stone containing microcrystalline Quartz particles. Chert is similar in composition to Flint, but has a lighter color. It was used in Paleolithic and Neolithic times for tools, weapons, and vessels. Currently, chert is used as an Abrasive, a semiprecious Stone, and as an Aggregate for the construction of buildings and roads.
Synonyms and Related Terms
hearthstone; firestone; malmstone; jasper; prase; cherte (Port.); Chert (Deut.)
Physical and Chemical Properties
- Fracture = conchoidal
- Mohs Hardness = 7.0
Comparisons
Properties of Common Abrasives
Resources and Citations
- B.Aston, J.Harrell, I.Shaw, "Stone" in Ancient Egyptian Materials and Technology, P.Nicholson, I.Shaw (eds.), Cambridge University Press, 2000.
- Mineralogy Database: Quartz
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
- Encyclopedia Britannica, http://www.britannica.com Comment: "chert and flint" [Accessed January 22, 2002].
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 690
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998