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Friedrich August Quenstedt
Fe2(SO4)3 · 11H2O
White to very pale ...
Named in 1888 by Gottlob Eduard Linck in honor of Friedrich August von Quenstedt [July 10, 1809 Eisleben, Saxony, Germany – December 21, 1889], professor of mineralogy and geology at Eberhard Karls Universität in Tübingen. Quenstedt was also noted for his paleontological research (ammonites and pterodactyls) and a fossil turtle, Proganochelys quenstedti, is named for him as well as five genera of other extinct species (2 coenlenterates, 1 ammonite, 1 mollusc, and 1 crinoid).
Straight fibrous to columnar crystals with a bright luster and fibrous appearance

Classification of Quenstedtite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations

8 : A2(XO4)3·H2O

25 : Sulphates
10 : Sulphates of Fe alone URL:
Please feel free to link to this page.

Type Occurrence of Quenstedtite

Year of Discovery:

Occurrences of Quenstedtite

Geological Setting:
Oxidized zone of pyrite rich orebodies, especially in arid climates.

Physical Properties of Quenstedtite

Sub-Vitreous, Silky
Diaphaneity (Transparency):
Transparent, Translucent
White to very pale violet to red-violet; colorless to pale rose in transmitted light.
Hardness (Mohs):
Perfect on {010}
Good on {100}
2.11 - 2.15 g/cm3 (Measured)    2.14 g/cm3 (Calculated)

Crystallography of Quenstedtite

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
Cell Parameters:
a = 6.184(5) Å, b = 23.6(2) Å, c = 6.539(5) Å
α = 94.18(8)°, β = 101.73(8)°, γ = 96.27(8)°
a:b:c = 0.262 : 1 : 0.277
Aggregates of minute crystals, tabular {010}, or short prismatic [100], highly modified at times.
Common on {010}.

Optical Data of Quenstedtite

Biaxial (+)
RI values:
nα = 1.547 nβ = 1.566 nγ = 1.594
Measured: 70° , Calculated: 82°
Max Birefringence:
δ = 0.047
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Strong r

Chemical Properties of Quenstedtite

Fe2(SO4)3 · 11H2O
All elements listed in formula:
Empirical Formula:
Fe23+(SO4)3 · 11H2O

Relationship of Quenstedtite to other Species

7.CB.05Dwornikite(Ni,Fe)SO4 · H2O
7.CB.05GunningiteZnSO4 · H2O
7.CB.05KieseriteMgSO4 · H2O
7.CB.05Poitevinite(Cu,Fe,Zn)SO4 · H2O
7.CB.05SzmikiteMnSO4 · H2O
7.CB.05SzomolnokiteFeSO4 · H2O
7.CB.05CobaltkieseriteCoSO4 · H2O
7.CB.07SanderiteMgSO4 · 2H2O
7.CB.10BonattiteCuSO4 · 3H2O
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2O
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2O
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2O
7.CB.15RozeniteFeSO4 · 4H2O
7.CB.15StarkeyiteMgSO4 · 4H2O
7.CB.15DrobeciteCdSO4 · 4H2O
7.CB.15CranswickiteMgSO4 · 4H2O
7.CB.20ChalcanthiteCuSO4 · 5H2O
7.CB.20JôkokuiteMnSO4 · 5H2O
7.CB.20PentahydriteMgSO4 · 5H2O
7.CB.20SiderotilFeSO4 · 5H2O
7.CB.25Bianchite(Zn,Fe)SO4 · 6H2O
7.CB.25Chvaleticeite(Mn,Mg)SO4 · 6H2O
7.CB.25FerrohexahydriteFeSO4 · 6H2O
7.CB.25HexahydriteMgSO4 · 6H2O
7.CB.25Moorhouseite(Co,Ni,Mn)SO4 · 6H2O
7.CB.25Nickelhexahydrite(Ni,Mg,Fe)SO4 · 6H2O
7.CB.30RetgersiteNiSO4 · 6H2O
7.CB.35BieberiteCoSO4 · 7H2O
7.CB.35BoothiteCuSO4 · 7H2O
7.CB.35MallarditeMnSO4 · 7H2O
7.CB.35MelanteriteFeSO4 · 7H2O
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2O
7.CB.35Alpersite(Mg,Cu)[SO4] · 7H2O
7.CB.40EpsomiteMgSO4 · 7H2O
7.CB.40GoslariteZnSO4 · 7H2O
7.CB.40MorenositeNiSO4 · 7H2O
7.CB.45AlunogenAl2(SO4)3 · 17H2O
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2O
7.CB.50AluminocoquimbiteFeAl(SO4)3 · 9H2O
7.CB.55CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
7.CB.55ParacoquimbiteFe2(SO4)3 · 9H2O
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
7.CB.60KorneliteFe2(SO4)3 · 7H2O
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2O
7.CB.75RömeriteFe2+Fe23+(SO4)4 · 14H2O
7.CB.80RansomiteCuFe2(SO4)4 · 6H2O
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2O
7.CB.85BíliniteFe2+Fe23+(SO4)4 · 22H2O
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
7.CB.85HalotrichiteFeAl2(SO4)4 · 22H2O
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2O
7.CB.90MeridianiiteMgSO4 · 11H2O
25.10.1SzomolnokiteFeSO4 · H2O
25.10.2RozeniteFeSO4 · 4H2O
25.10.3SiderotilFeSO4 · 5H2O
25.10.4FerrohexahydriteFeSO4 · 6H2O
25.10.5MelanteriteFeSO4 · 7H2O
25.10.6Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
25.10.8KorneliteFe2(SO4)3 · 7H2O
25.10.9CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
25.10.10ParacoquimbiteFe2(SO4)3 · 9H2O
25.10.12FerricopiapiteFe5(SO4)6O(OH) · 20H2O
25.10.13MetahohmanniteFe23+(SO4)2O · 4H2O
25.10.14HohmanniteFe23+(SO4)2O · 8H2O
25.10.15ButleriteFe3+(SO4)(OH) · 2H2O
25.10.16ParabutleriteFe3+(SO4)(OH) · 2H2O
25.10.17AmarantiteFe23+(SO4)2O · 7H2O
25.10.18FibroferriteFe3+(SO4)(OH) · 5H2O
25.10.20RömeriteFe2+Fe23+(SO4)4 · 14H2O
25.10.21BíliniteFe2+Fe23+(SO4)4 · 22H2O
25.10.22CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O

Other Names for Quenstedtite

Name in Other Languages:

Other Information

Other Information:
Easily soluble in water.
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 Quenstedtite

Reference List:
Linck (1889) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 15: 11.

Ungemach (1935) Bulletin de la Société française de Minéralogie: 58: 97.

Bandy (1938) American Mineralogist: 23: 669.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 535.

American Mineralogist (1974): 59: 582-586.

Internet Links for Quenstedtite

Localities for Quenstedtite

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.
  • Yukon
    • Whitehorse Mining District
      • Carcross
        • Tagish Lake
          • Windy Arm
Gomi, A. (2001) Suisyou (Quartz), 50, #3, 173-180.
  • Antofagasta Region
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
Gunnar Farber specimens
    • El Loa Province
      • Calama
        • Cerritos Bayos
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 536.; Kampf, A.R.; Mills, S.J.; Housley, R.M.; Williams, P.A.; Dini, M. (2012): Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine 76, 851-861.
        • Chuquicamata District
          • Toki Cu deposit (Toki Cluster)
Natural History Museum Vienna collection (Uwe Kolitsch SXRD on Arturo Molina material)
  • Atacama Region
    • Copiapó Province
Neues Jahrb.Min.(1888) 1, p. 213; MinRec 6:106; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 457, 536.
  • Hesse
    • Richelsdorf District
      • Süss
        • Richelsdorf Smelter
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • North Rhine-Westphalia
    • Sauerland
      • Marsberg
Wittern: "Mineralfundorte in Deutschland", 2001
  • Rhineland-Palatinate
    • Lahn valley
Wittern: "Mineralfundorte in Deutschland", 2001
        • Frücht
Der Aufschluss Vol.55, March/April 2004; SCHNORRER, G. (1995): Mineralogische Neuheiten von bekannten deutschen Fundorten. Lapis 20 (12), 43-48; 62.
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Plaka
          • Plaka Mines
Schnorrer, G. & Breitenbach, H. (1996): Lavrion: Neufunde aus dem antiken Bergbau und in historischen Schlacken. Lapis, 21 (1), 45-48; 62.
  • Borsod-Abaúj-Zemplén Co.
    • Bükk Mts
      • Miskolc
Szakáll & Jánosi: Minerals of Hungary, 1995
  • Hokkaido
    • Sorachi Province
      • Mikasa City
Miura et al. (1994) Mineralogical Magazine, 58, 649-653
  • Harghita Co.
Ed.:Szakáll S.-Kristály F.2010:Mineralogy of Székelyland,Eastern Transylvania,Romania
  • Banská Bystrica Region
    • Banská Štiavnica Co.
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
  • California
    • San Bernardino Co.
      • Calico Mts (Calico Hills)
        • Calico District (Daggett District)
          • Yermo
            • Mule Canyon
Weber, D. (1975): Quenstedtite from California. Mineralogical Record 6(3), 106; Moller, W.P. (1963) Sulfur Hole. Mineralogist: 31, part 1, N. 3: 12-16; part 2, No. 4: 13; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 273; Joseph F. Cooper, Jr., Gail E. Dunning, Ted A. Hadley, and William P. Moller (2001) The Sulfur Hole, Calico District, San Bernardino County, California
  • Iowa
    • Muscatine Co.
Yale Peabody Museum
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