Ludwigite
Revision as of 07:40, 4 December 2009 by Physchim62 (talk | contribs) (Imported from https://secure.wikimedia.org/wikipedia/en/w/index.php?title=Ludwigite&oldid=311476654)
| Ludwigite | |
|---|---|
 | |
| General | |
| Category | mineral |
| Chemical formula | Mg2Fe3+BO5 |
| Identification | |
| Molar mass | 195.26 |
| Color | Dark green, Black, Black green |
| Crystal habit | Massive - Fibrous - Distinctly fibrous fine-grained forms |
| Crystal system | Orthorhombic (2/m 2/m 2/m) Space Group: Pbam |
| Cleavage | [001] Perfect |
| Fracture | Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Mohs scale hardness | 5.5 |
| Luster | Silky |
| Streak | greenish black |
| Specific gravity | 3.7 - 4, Average = 3.85 |
| Optical properties | Biaxial (+), a=1.83-1.85, b=1.83-1.9, g=1.97-2.03 |
| Other characteristics | non-radioactive, non-magnetic, Non-fluorescent. |
Ludwigite is a mineral, a magnesium-iron borate named for Ernst Ludwig (1842-1915), an Austrian chemist at the University of Vienna.[1]
References
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