Difference between revisions of "Galena"
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| − | {{Mineral | name=Galena | cdesc=Lead sulfide | formula=PbS | | + | {{Mineral |
| + | | name=Galena | ||
| + | | image=Galena.jpg | ||
| + | | cdesc=Lead sulfide | ||
| + | | formula=PbS | ||
| + | | colors=Dark lead-gray; metallic when fresh | ||
| + | | streak= Dark lead-gray | ||
| + | | hardness=2.5 | ||
| + | | cleavage=Perfect in three directions at 90º | ||
| + | | fracture= Subconchoidal, (rare); brittle | ||
| + | | sgravity=7.4 to 7.6 | ||
| + | | csystem=Isometric | ||
| + | | chabit=Commonly in [[cube]]s and [[octahedron]]s; [[dodecahedron]]s less frequent; also [[massive]] and in cleavage fragments, [[coarse]]- or [[fine-grained]], [[fibrous]] | ||
| + | | cleavage=Cubic cleavage | ||
| + | | enviro=Galena is the commonest of all lead minerals and occurs in several environments. | ||
| + | | occur=Fine crystals and crystal groups | ||
| + | | nameorigin=From the [[Latin]] ''galena'', which was applied to [[lead]] [[ore]] or the [[dross]] from melted lead. | ||
| + | }} | ||
Chesterman, pp. 361-362 | Chesterman, pp. 361-362 | ||
| − | =Sources= | + | ==Sources== |
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987) | *Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987) | ||
<includeonly>[[Category:Minerals]]</includeonly> | <includeonly>[[Category:Minerals]]</includeonly> | ||
Revision as of 20:47, July 15, 2007
| Galena | |
|---|---|
| |
| Chemical name | Lead sulfide |
| Chemical formula | PbS |
| Identification | |
| Colors | Dark lead-gray; metallic when fresh |
| Crystal habit | Commonly in cubes and octahedrons; dodecahedrons less frequent; also massive and in cleavage fragments, coarse- or fine-grained, fibrous |
| Crystal system | Isometric |
| Cleavage | Cubic cleavage |
| Fracture | Subconchoidal, (rare); brittle |
| Hardness | 2.5 |
| Name origin | From the Latin galena, which was applied to lead ore or the dross from melted lead. |
| Specific gravity | 7.4 to 7.6 |
| Streak | Dark lead-gray |
Chesterman, pp. 361-362
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)