Fleischerite
| Fleischerite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) | Pb3Ge(SO4)2(OH)6 · 3H2O |
| IMA symbol | fsh |
| Strunz classification | 7.DF.25 |
| Dana classification | 31.07.06.03 (hydrated silicates containing hydroxyl or halogen) |
| Crystal system | Hexagonal |
| Identification | |
| Color | White, light reddish-pink |
| Crystal habit | Accicular |
| Tenacity | brittle |
| Mohs scale hardness | 2.5-3 |
| Luster | Sub-vitreous, silky |
| Streak | White |
| Density | 4.3 |
| Birefringence | 0.029 |
| Pleochroism | Non-pleochroic |
Fleischerite is a type of mineral. Named after Michael Fleischer, a co-founder of the International Mineralogical Association.[1] Recognized in 1960. Has its own group made of itself, schaurteite, despujolsite, mallestigite, and genplesite.[2] It is often confused with dundasite.
Occurrence
[edit]Fleischerite is found only in Tsumeb (Ongopolo) Mine, Namibia. It forms in oxidized portions of a dolostone-hosted hydrothermal germanium-bearing polymetallic ore deposits.[3] The oldest samples are estimated to be 541 million years old.[4]
Appearance
[edit]Very thin, up to 1.5 cm in length crystals with a tender reddish hue that form sheets of subparallel individuals or hedgehog-like aggregates.[5]
Paragenesis with other minerals
[edit]- When fleischerite, cerussite, and mimetite cover a tennantite matrix, they create a rounded, matte white concretion.
- When a dolostone core is covered with plumbojarosite and mimetite, which give it a greenish hue, fleischerite grows on top of them all.
- Rarely, fleischerite enters paragenesis with alamosite, anglesite, hematite, leadhillite, melanotekite, mimetite, kegelite, larsenite, plumbojarosite, plumbotsumite and queitite.
- Fleischerite also may have paragenesis with other secondary germanium minerals.[5]
References
[edit]- ^ "Fleischerite". mindat.org. Retrieved 2024-11-14.
- ^ "The Fleischerite Group of Minerals | Fred Haynes". 2016-12-14. Retrieved 2024-11-14.
- ^ "Fleischerite Mineral Data". webmineral.com. Retrieved 2024-11-14.
- ^ "Dynamic Earth Collection - About". dynamicearthcollection.com. Retrieved 2024-11-14.
- ^ a b "fleischerite". mingen.hk. Retrieved 2024-12-05.