Franckeite: Difference between revisions
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| caption = Franckeite var. Potosíite, San José Mine, [[Cercado Province (Oruro)|Cercado Province]] Bolivia. Field of view about |
| caption = Franckeite var. Potosíite, San José Mine, [[Cercado Province (Oruro)|Cercado Province]] Bolivia. Field of view about 10{{nbsp}}mm. |
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| formula = (Pb,Sn<sup>2+</sup>)<sub>6</sub>Fe<sup>2+</sup>Sn<sub>2</sub>Sb<sub>2</sub>S<sub>14</sub> |
| formula = (Pb,Sn<sup>2+</sup>)<sub>6</sub>Fe<sup>2+</sup>Sn<sub>2</sub>Sb<sub>2</sub>S<sub>14</sub> |
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| IMAsymbol = Fke<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols |
| IMAsymbol = Fke<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> |
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| molweight = |
| molweight = |
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| strunz = 2.HF.25b |
| strunz = 2.HF.25b |
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| fracture = |
| fracture = |
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| tenacity = Flexible, inelastic; slightly malleable |
| tenacity = Flexible, inelastic; slightly malleable |
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| mohs = 2.5 |
| mohs = 2.5 – 3 |
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| luster = Metallic |
| luster = Metallic |
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| streak = Grayish black |
| streak = Grayish black |
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*[[List of minerals named after people]] |
*[[List of minerals named after people]] |
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==References== |
== References == |
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{{Reflist}} |
{{Reflist}} |
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{{Commons category|Franckeite|position=left}} |
{{Commons category|Franckeite|position=left}} |
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[[Category:Triclinic minerals]] |
[[Category:Triclinic minerals]] |
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[[Category:Minerals in space group 2]] |
[[Category:Minerals in space group 2]] |
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[[Category:Glances]] |
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{{sulfide-mineral-stub}} |
{{sulfide-mineral-stub}} |
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Latest revision as of 09:41, 19 September 2024
| Franckeite | |
|---|---|
 Franckeite var. Potosíite, San José Mine, Cercado Province Bolivia. Field of view about 10 mm. | |
| General | |
| Category | Sulfosalt mineral |
| Formula (repeating unit) | (Pb,Sn2+)6Fe2+Sn2Sb2S14 |
| IMA symbol | Fke[1] |
| Strunz classification | 2.HF.25b |
| Dana classification | 03.01.04.02 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Identification | |
| Color | Grayish black |
| Crystal habit | Typically in spherical, rosette aggregates of thin plates; commonly massive, radiated, or foliated |
| Twinning | Complex |
| Cleavage | {010}, perfect |
| Tenacity | Flexible, inelastic; slightly malleable |
| Mohs scale hardness | 2.5 – 3 |
| Luster | Metallic |
| Streak | Grayish black |
| Diaphaneity | Opaque |
| Specific gravity | 5.88 – 5.92 |
| Pleochroism | Weak |
| References | [2][3][4] |
Franckeite, chemical formula Pb5Sn3Sb2S14, belongs to a family of complex sulfide minerals. Franckeite is a sulfosalt. It is closely related to cylindrite.
It was first described in 1893 for an occurrence in Chocaya, Potosí Department, Bolivia. It is named after the mining engineers, Carl and Ernest Francke.[3] It can be found in Bolivia at Poopó in Oruro and at Las Aminas, southeast of Chocaya, in Potosi. Franckeite has an average density of 5.7 and can be both grayish black, blackish gray in color.
It occurs in hydrothermal silver-tin deposits in Bolivia and in contact metamorphosed limestone deposit in the Kalkar quarry in California. It occurs with cylindrite, teallite, plagionite, zinkenite, cassiterite, wurtzite, pyrrhotite, marcasite, arsenopyrite, galena, pyrite, sphalerite, siderite and stannite.[2]
See also
[edit]References
[edit]- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b http://rruff.geo.arizona.edu/doclib/hom/franckeite.pdf Handbook of Mineralogy
- ^ a b http://www.mindat.org/min-1592.html Mindat with location data
- ^ http://webmineral.com/data/Franckeite.shtml Webmineral data
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