Difference between revisions of "Glauconite"
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| − | [[File: | + | [[File:glauconitelarge.jpg|thumb|Glauconite]] |
== Description == | == Description == | ||
| − | + | [[File:glaucontie C100x.jpg|thumb|Glauconite at 100x (visible light left; UV light right)]] | |
A dull green mica mineral composed of hydrated potassium iron silicate. Glauconite, unlike other micas, usually occurs as pelletlike grains in marine environments and, hence, is sometimes called green sand. It is formed from the alteration of iron-bearing silicates by ocean water and organisms. Glauconite is found along the Atlantic coast of the North and South America and on the ocean floors. Powdered glauconite has been used as a [[green earth]] pigment for paints. | A dull green mica mineral composed of hydrated potassium iron silicate. Glauconite, unlike other micas, usually occurs as pelletlike grains in marine environments and, hence, is sometimes called green sand. It is formed from the alteration of iron-bearing silicates by ocean water and organisms. Glauconite is found along the Atlantic coast of the North and South America and on the ocean floors. Powdered glauconite has been used as a [[green earth]] pigment for paints. | ||
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[[[SliderGallery rightalign|Glauconite, Harvard Mineralogical Museum.PNG~FTIR (MFA)|f367sem.jpg~SEM|f367edsbw.jpg~EDS]]] | [[[SliderGallery rightalign|Glauconite, Harvard Mineralogical Museum.PNG~FTIR (MFA)|f367sem.jpg~SEM|f367edsbw.jpg~EDS]]] | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Crystals = monoclinic No apparent cleavage. | + | * Crystals = monoclinic No apparent cleavage. |
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! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.5-2.7 | + | | 2.5-2.7 g/ml |
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! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
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| − | == | + | ==Resources and Citations== |
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| − | + | * Mineralogy Database: [http://www.webmineral.com/data/Glauconite.shtml Glauconite] | |
| − | * Wikipedia | + | * Wikipedia: http://en.wikipedia.org/wiki/Glauconite (Accessed Sept. 7, 2005)density = 2.2-2.8 |
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "glauconite" | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "glauconite" [Accessed December 11, 2001]. |
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 Comment: density 2.5-2.7 and ref.index.1.62 | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 Comment: density 2.5-2.7 and ref.index.1.62 | ||
Latest revision as of 13:30, 27 August 2022
Description
A dull green mica mineral composed of hydrated potassium iron silicate. Glauconite, unlike other micas, usually occurs as pelletlike grains in marine environments and, hence, is sometimes called green sand. It is formed from the alteration of iron-bearing silicates by ocean water and organisms. Glauconite is found along the Atlantic coast of the North and South America and on the ocean floors. Powdered glauconite has been used as a Green earth pigment for paints.
Synonyms and Related Terms
green earth; Glaukonit (Deut.); glauconite (Fr., It., Port.); glaykofanis (Gr.); groene aarde (Ned.); glaukonit (Pol., Sven.); green sand; greensand
Physical and Chemical Properties
- Crystals = monoclinic No apparent cleavage.
| Composition | (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2 |
|---|---|
| Mohs Hardness | 2 |
| Density | 2.5-2.7 g/ml |
| Refractive Index | 1.62 |
Resources and Citations
- Mineralogy Database: Glauconite
- Wikipedia: http://en.wikipedia.org/wiki/Glauconite (Accessed Sept. 7, 2005)density = 2.2-2.8
- Encyclopedia Britannica, http://www.britannica.com Comment: "glauconite" [Accessed December 11, 2001].
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: density 2.5-2.7 and ref.index.1.62
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976