Rostite
A valid IMA mineral species
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About Rostite
Formula:
Al(SO4)(OH) · 5H2O
Crystal System:
Orthorhombic
Name:
Named in 1979 by František Čech in honor of Rudolf Rost (11 July 1912, Libušín, Czech Republic – 23 July 1999, Prague, Czech Republic), Professor of Mineralogy at the Charles University, Prague, Czech Republic, who had re-characterized the mineral in 1937, considering it to be identical to tamarugite.
Dimorph of:
First observed in a burning coal dump.
Compare also the related khademite.
Note that "rostite" from the type locality contains considerable F (4.25 wt.%) (Zacek & Povondra, 1988) and subsequently was identified as khademite (Zacek et al., 1995).
Compare also the related khademite.
Note that "rostite" from the type locality contains considerable F (4.25 wt.%) (Zacek & Povondra, 1988) and subsequently was identified as khademite (Zacek et al., 1995).
Unique Identifiers
Mindat ID:
3461
Long-form identifier:
mindat:1:1:3461:2
Similar Names
| Postite | A valid IMA mineral species | Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O |
| Restite | A rock subtype | |
| Rosasite | A valid IMA mineral species - grandfathered | (Cu,Zn)2(CO3)(OH)2 |
| Roseite | (Os,Ir)S | |
| Rosiaite | A valid IMA mineral species | PbSb25+O6 |
| Rosite (of Huot) | A synonym of Chalcostibite | |
| Rossite | A valid IMA mineral species - grandfathered | Ca(VO3)2 · 4H2O |
IMA Classification of Rostite
Classification of Rostite
7.DB.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.9.11.2
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.6.1
25 : Sulphates
6 : Sulphates of Al and Tl
25 : Sulphates
6 : Sulphates of Al and Tl
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rst | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Optical Data of Rostite
Type:
Biaxial (+)
RI values:
nα = 1.461 nβ = 1.47 nγ = 1.484
Max. Birefringence:
δ = 0.023
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (78°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (78°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
r > v strong
Chemistry of Rostite
Mindat Formula:
Al(SO4)(OH) · 5H2O
Element Weights:
Elements listed:
Crystallography of Rostite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Comment:
Space group Pcab. Range: a = 11.169–11.187, b = 13.039–13.060, c = 10.871–10.893 A.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Rostite
Synonyms of Rostite
Other Language Names for Rostite
Common Associates
Associations Based on Photo Data:
| 3 photos of Rostite associated with Ilsemannite | Mo3O8 · nH2O |
| 2 photos of Rostite associated with Clairite | (NH4)2Fe3(SO4)4(OH)3 · 3H2O |
| 1 photo of Rostite associated with 'Arsensulfurite' | (S,As)8 |
| 1 photo of Rostite associated with Gypsum | CaSO4 · 2H2O |
| 1 photo of Rostite associated with 'Shale' | |
| 1 photo of Rostite associated with Metavoltine | K2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DB.05 | Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
| 7.DB.05 | Aubertite | CuAl(SO4)2Cl · 14H2O |
| 7.DB.05 | Magnesioaubertite | (Mg,Cu)Al(SO4)2Cl · 14H2O |
| 7.DB.10 | Khademite | Al(SO4)F · 5H2O |
| 7.DB.15 | Jurbanite | Al(SO4)(OH) · 5H2O |
| 7.DB.20 | Minasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Anorthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Orthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.25 | Bobjonesite | (V4+O)(SO4) · 3H2O |
| 7.DB.27 | Karpovite | Tl2VO(SO4)2(H2O) |
| 7.DB.30 | Metahohmannite | Fe3+2(SO4)2O · 4H2O |
| 7.DB.30 | Hohmannite | Fe3+2(SO4)2O · 8H2O |
| 7.DB.30 | Amarantite | Fe3+2(SO4)2O · 7H2O |
| 7.DB.35 | Calciocopiapite | CaFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Zincocopiapite | ZnFe3+4(SO4)6(OH)2 · 18H2O |
| 7.DB.35 | Aluminocopiapite | Al2/3Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Cuprocopiapite | Cu2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Ferricopiapite | Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rostite
mindat.org URL:
https://www.mindat.org/min-3461.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Rostite
Reference List:
Jambor, John L., Vanko, David A. (1989) New mineral names. American Mineralogist, 74 (7-8) 946-951 p.951
Košek, Filip, Žáček, Vladimír, Škoda, Radek, Laufek, František, Jehlička, Jan (2019) New mineralogical data for khademite (orthorhombic AlSO4F·5H2O) and the story of rostite (orthorhombic AlSO4OH·5H2O) from Libušín near Kladno, the Czech Republic. Journal of Molecular Structure, 1175. 208-213 doi:10.1016/j.molstruc.2018.07.061
Localities for Rostite
Showing 17 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Ashley et al. (1999) |
| Harris et al. (2003) |
Canada | |
| Norman Wilson personal collection |
China | |
| Liu et al. (2018) |
Costa Rica | |
| Rodríguez et al. (2017) |
Czech Republic (TL) | |
| Neues Jahrb.Min. (1979) |
Germany | |
| Witzke et al. (2015) |
| Košek (2018) | |
Greece | |
| Skarpelis et al. (2009) |
| Rieck (n.d.) |
Iceland | |
| Carson III (2015) |
Italy | |
| Sabelli C. (1984) +2 other references |
Lebanon | |
| Kruszewski (2019) |
Poland | |
| Kruszewski (2012) |
Russia | |
| Eremin et al. (2014) |
Tajikistan | |
| PXRD (Lukasz Kruszewski) |
USA | |
| U. S. Geological Survey Open-File ... |
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Kladno mine, Libušin, Kladno District, Central Bohemian Region, Czech Republic