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Al(SO4)(OH) · 5H2O
Named after Rudolph Rost (1902–?), Professor of Mineralogy, at the Charles University, Prague, Czech Republic, who first characterized the mineral.
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).

Classification of Rostite


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

9 : (AB)(XO4)Zq·xH2O

25 : Sulphates
6 : Sulphates of Al and Tl URL:
Please feel free to link to this page.

Type Occurrence of Rostite

Crystallography of Rostite

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space group Pcab. Range: a = 11.169–11.187, b = 13.039–13.060, c = 10.871–10.893 A.

Optical Data of Rostite

Biaxial (+)
RI values:
nα = 1.461 nβ = 1.470 nγ = 1.484
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v strong

Chemical Properties of Rostite

Al(SO4)(OH) · 5H2O
All elements listed in formula:

Relationship of Rostite to other Species

7.DB.05AubertiteCuAl(SO4)2Cl · 14H2O
7.DB.05Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
7.DB.05Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O
7.DB.10KhademiteAl(SO4)F · 5H2O
7.DB.15JurbaniteAl(SO4)(OH) · 5H2O
7.DB.20Minasragrite(V4+O)(SO4) · 5H2O
7.DB.20Orthominasragrite(V4+O)(SO4) · 5H2O
7.DB.20Anorthominasragrite(V4+O)(SO4) · 5H2O
7.DB.25Bobjonesite(V4+O)(SO4) · 3H2O
7.DB.30AmarantiteFe23+(SO4)2O · 7H2O
7.DB.30HohmanniteFe23+(SO4)2O · 8H2O
7.DB.30MetahohmanniteFe23+(SO4)2O · 4H2O
7.DB.35AluminocopiapiteAl2/3Fe43+(SO4)6(OH)2 · 20H2O
7.DB.35CalciocopiapiteCaFe4(SO4)6(OH)2 · 10H2O
7.DB.35CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
7.DB.35CuprocopiapiteCuFe4(SO4)6(OH)2 · 20H2O
7.DB.35FerricopiapiteFe5(SO4)6O(OH) · 20H2O
7.DB.35MagnesiocopiapiteMgFe43+(SO4)6(OH)2 · 20H2O
7.DB.35ZincocopiapiteZnFe43+(SO4)6(OH)2 · 18H2O
25.6.2JurbaniteAl(SO4)(OH) · 5H2O
25.6.3KhademiteAl(SO4)F · 5H2O
25.6.4Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
25.6.5AluminiteAl2(SO4)(OH)4 · 7H2O
25.6.6Meta-alunogenAl2(SO4)3 · 12H2O
25.6.7AlunogenAl2(SO4)3 · 17H2O
25.6.8FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
25.6.10HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
25.6.11ZaheriteAl12(SO4)5(OH)26 · 20H2O
25.6.12TamarugiteNaAl(SO4)2 · 6H2O
25.6.13MendoziteNaAl(SO4)2 · 11H2O
25.6.14Alum-(Na)NaAl(SO4)2 · 12H2O
25.6.16KaliniteKAl(SO4)2 · 11H2O Not confirmed
25.6.17Alum-(K)KAl(SO4)2 · 12H2O
25.6.20Tschermigite(NH4)Al(SO4)2 · 12H2O

Other Names for Rostite

Name in Other Languages:
Simplified Chinese:斜方铝矾

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.

References for Rostite

Reference List:
American Mineralogist (1975): 60: 486.

American Mineralogist (1979): 64: 1331.

Zacek, V. & Povondra, P. (1988): Neues Jahrbuch für Mineralogie, Monatshefte (1988): 10: 479-480.

American Mineralogist (1989): 74: 951.

Zacek, V., Oplustil, S., Mayova, A. & Meyer, F. R. (1995): Die Mineralien von Kladno in Mittelböhmen, Tschechische Republik. Mineralien-Welt 6 (1), 13-30 (in German).

Internet Links for Rostite

Localities for Rostite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Czech Republic (TL)
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Kladno
        • Libušin
Neues Jahrb.Min.,Mh.(1979) 193-196
  • North Rhine-Westphalia
    • Aachen
      • Alsdorf
Witzke, T., de Wit, F., Kolitsch, U. and Blaß, G. (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, pp. 203-240, in: Stracher, G. B., Prakash, A. and Sokol, E. V.: Coal and Peat Fires: A Global Perspective, Volume 3: Case Studies - Coal Fires, Elsevier, 786 pp.
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Skarpelis, N. and Argyraki, A. (2009): The geology and origin of supergene ores in Lavrion (Attica, Greece). Resource Geology, 59, 1-14.
  • Tuscany
    • Siena Province
      • Chiusdino
Sabelli C. (1984) - I minerali delle Cetine di Cotorniano (SI); I solfati dimorfi jurbanite e rostite. Periodico di Mineralogia, Roma, pp. 53-65 and Brizzi G., Ciselli I, Santucci A. (1986) - Ultime novità da le Cetine di Cotorniano - Riv. Miner. Ital., Milano, fasc. 3, pp.145-155; Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Rybnik
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Zeravshan Range
      • Yagnob River
PXRD (Lukasz Kruszewski)
  • Alaska
    • Valdez-Cordova Borough
      • Chisana District
U. S. Geological Survey Open-File Report 02-195
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