Ludwigite
Revision as of 06:48, 4 December 2009 by Physchim62 (talk | contribs)
| Ludwigite | |
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| 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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