Difference between revisions of "Ludwigite"
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{{Infobox mineral | {{Infobox mineral | ||
| − | | name = | + | | name = Ludwigite |
| − | | category = mineral | + | | category = [[Borate mineral]]s, Ludwigite series |
| + | | strunz = 06.AB.30 | ||
| + | | dana = 24.02.01.01 | ||
| boxwidth = | | boxwidth = | ||
| boxbgcolor = | | boxbgcolor = | ||
| Line 7: | Line 9: | ||
| caption = | | caption = | ||
| formula = Mg<sub>2</sub>Fe<sup>3+</sup>BO<sub>5</sub> | | formula = Mg<sub>2</sub>Fe<sup>3+</sup>BO<sub>5</sub> | ||
| − | | molweight = 195.26 | + | | molweight = 195.26 g/mol |
| − | | color = | + | | color = dark green, black, black-green |
| habit = Massive - Fibrous - Distinctly fibrous fine-grained forms | | habit = Massive - Fibrous - Distinctly fibrous fine-grained forms | ||
| − | | system = [[Orthorhombic]] | + | | system = [[Orthorhombic crystal system|orthorhombic]] |
| + | | symmetry = 2/m 2/m 2/m | ||
| cleavage = [001] Perfect | | cleavage = [001] Perfect | ||
| fracture = Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | | fracture = Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
| − | | mohs = | + | | mohs = 5½ |
| luster = Silky | | luster = Silky | ||
| refractive = | | refractive = | ||
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| pleochroism = | | pleochroism = | ||
| streak = greenish black | | streak = greenish black | ||
| − | | gravity = 3. | + | | gravity = 3.7–4 |
| melt = | | melt = | ||
| fusibility = | | fusibility = | ||
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| solubility = | | solubility = | ||
| diaphaneity = | | diaphaneity = | ||
| − | | other = | + | | other = |
| + | | references = <ref name="WebMineral">{{WebMineral-ref | name = Ludwigite | url = http://webmineral.com/data/Ludwigite.shtml | accessdate = 2009-12-04}}.</ref><ref name="MinDat">{{MinDat-ref | name = Ludwigite | id = 2454 | accessdate = 2009-12-04}}.</ref><ref>{{citation | last1 = Irwin | first1 = M. B. | last2 = Peterson | first2 = R. C. | year = 1999 | title = The crystal structure of ludwigite | journal = Canadian Mineralogist | volume = 37 | pages = 939–43}}.</ref> | ||
}} | }} | ||
| − | '''Ludwigite ''' is | + | '''Ludwigite ''' is a [[magnesium]]–[[iron]] [[borate mineral]] named for [[Ernst Ludwig (chemist)|Ernst Ludwig]] (1842–1915), an [[Austria]]n chemist at the [[University of Vienna]].<ref name="WebMineral"/><ref name="MinDat"/> |
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
| − | |||
| − | |||
[[Category:Magnesium minerals]] | [[Category:Magnesium minerals]] | ||
Latest revision as of 06:48, 4 December 2009
| Ludwigite | |
|---|---|
 | |
| General | |
| Category | Borate minerals, Ludwigite series |
| Chemical formula | Mg2Fe3+BO5 |
| Strunz classification | 06.AB.30 |
| Dana classification | 24.02.01.01 |
| Crystal symmetry | 2/m 2/m 2/m |
| Identification | |
| Molar mass | 195.26 g/mol |
| Color | dark green, black, black-green |
| Crystal habit | Massive - Fibrous - Distinctly fibrous fine-grained forms |
| Crystal system | orthorhombic |
| Cleavage | [001] Perfect |
| Fracture | Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Mohs scale hardness | 5½ |
| Luster | Silky |
| Streak | greenish black |
| Specific gravity | 3.7–4 |
| Optical properties | Biaxial (+), a=1.83-1.85, b=1.83-1.9, g=1.97-2.03 |
| References | [1][2][3] |
Ludwigite is a magnesium–iron borate mineral named for Ernst Ludwig (1842–1915), an Austrian chemist at the University of Vienna.[1][2]
References
- ↑ 1.0 1.1 Ludwigite, <http://webmineral.com/data/Ludwigite.shtml> (accessed 4 December 2009), WebMineral.com.
- ↑ 2.0 2.1 Ludwigite, <http://www.mindat.org/show.php?id=2454> (accessed 4 December 2009), MinDat.org.
- ↑ Irwin, M. B.; Peterson, R. C. The crystal structure of ludwigite. Canadian Mineralogist 1999, 37, 939–43.
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