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Ettringite

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Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© Stephan Wolfsried

Show Ettringite Photos (90)
Formula:
Ca
 
6
Al
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
System:TrigonalColour:Colourless; colourless ...
Hardness:2 - 2½
Name:After the type locality at Ettringen, Rhineland-Palatinate, Germany.


Ettringite Group

Can form solid solution with Thaumasite.

Classification of Ettringite

IMA status:Approved
Strunz 8th edition ID:6/D.13-10
Strunz 9th edition ID:7.DG.15
Nickel-Strunz 10th (pending) edition ID:7.DG.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
Dana 8th edition ID:31.10.2.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
10 : Miscellaneous
Hey's CIM Ref.:25.4.13

25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
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Type Occurrence of Ettringite

Type Locality:Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
Year of Discovery:1874
Geological Setting of type material:In cavities of metamorphosed limestone inclusions in a leucite-nepheline-tephrite rock.

Physical Properties of Ettringite

Diaphaneity (Transparency):Transparent
Colour:Colourless; colourless in transmitted light.
Comment:Turns white upon partial dehydration.
Hardness (Mohs):2 - 2½
Cleavage:Perfect
On {10_10}, perfect.
Density (measured):1.77 g/cm3
Density (calculated):1.76 g/cm3

Crystallography of Ettringite

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:P3 1c
Cell Parameters:a = 11.23Å, c = 21.44Å
Ratio:a:c = 1 : 1.909
Unit Cell Volume:V 2,341.61 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals small and prismatic [0001], commonly without terminal faces.

Optical Data of Ettringite

Type:Uniaxial (-)
RI values: nω = 1.491 nε = 1.470
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Comments:Becomes uniaxial positive on dehydration.

Chemical Properties of Ettringite

Formula:
Ca
 
6
Al
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
Essential elements:Al, Ca, H, O, S
All elements listed in formula:Al, Ca, H, O, S

Relationship of Ettringite to other Species

Related Minerals - Nickel-Strunz Grouping):
7.DG.05Darapskite
Na
 
3
NO
 
3
SO
 
4
·H
 
2
O
7.DG.10Clinoungemachite
(Na, K, Fe, SO
 
4
)
7.DG.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.10Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.15Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
7.DG.15Charlesite
Ca
 
6
(Al,Si)
 
2
[(OH,O)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 26H
 
2
O
7.DG.15Jouravskite
Ca
 
6
Mn
3+
2
[(OH)
 
4
|(SO
 
4
,CO
 
3
)]
 
3
 · 26H
 
2
O
7.DG.15Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
[(OH)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 25H
 
2
O
7.DG.15Thaumasite
Ca
 
3
[CO
 
3
|SO
 
4
|Si(OH)
 
6
] · 12H
 
2
O
7.DG.15Carraraite
Ca
 
3
Ge(OH)
 
6
(SO
 
4
)(CO
 
3
)·12H
 
2
O
7.DG.15Buryatite
Ca
 
3
(Si,Fe,Al)[SO
 
4
][B(OH)
 
4
](OH)
 
5
O•
 
12
H
 
2
O
7.DG.15Korkinoite
7.DG.20Rapidcreekite
Ca
 
2
[CO
 
3
|SO
 
4
] · 4H
 
2
O
7.DG.25Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
Cl
 
4
(OH)
 
4
·7H
 
2
O
7.DG.25Chelyabinskite
(Ca,Mg)
 
3
[(SO
 
4
,CO
 
3
)
 
2
|Si(OH)
 
6
] · 9H
 
2
O (?)
7.DG.30Nakauriite
Cu
 
8
[(OH)
 
6
|CO
 
3
|(SO
 
4
)
 
4
] · 48H
 
2
O
7.DG.35Chessexite
(Na,K)
 
4
Ca
 
2
(Mg,Zn)
 
3
Al
 
8
[(SO
 
4
)
 
10
|(SiO
 
4
)
 
2
] · 40H
 
2
O
7.DG.40Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
7.DG.40Fuenzalidaite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
Related Minerals - Hey's Index Grouping:
25.4.1Anhydrite
CaSO
 
4
25.4.2Bassanite
Ca[SO
 
4
] · 0.5H
 
2
O
25.4.3Gypsum
Ca[SO
 
4
] · 2H
 
2
O
25.4.4Glauberite
Na
 
2
Ca(SO
 
4
)
 
2
25.4.5Cesanite
Na
 
3
Ca
 
2
[OH|(SO
 
4
)
 
3
]
25.4.6Eugsterite
Na
 
4
Ca(SO
 
4
)
 
3
·2H
 
2
O
25.4.7Hydroglauberite
Na
 
10
Ca
 
3
(SO
 
4
)
 
8
·6H
 
2
O
25.4.8Syngenite
K
 
2
Ca(SO
 
4
)
 
2
·H
 
2
O
25.4.9Görgeyite
K
 
2
Ca
 
5
(SO
 
4
)
 
6
·H
 
2
O
25.4.10Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
·2H
 
2
O
25.4.11Koktaite
(NH
 
4
)
 
2
Ca(SO
 
4
)
 
2
·H
 
2
O
25.4.12Ye'elimite
Ca
 
4
Al
 
6
[O
 
12
|SO
 
4
]
25.4.14Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
25.4.15Celestine
SrSO
 
4
25.4.16Kalistrontite
K
 
2
Sr(SO
 
4
)
 
2
25.4.17Baryte
BaSO
 
4

Other Names for Ettringite

Synonyms:
Woodfordite
German names:
Ettringit
Russian names:
Эттрингит
Spanish names:
Ettringita

Other Information

Other Information:Readily soluble in dilute acids. Partially decomposed by water, rendering an alkaline solution.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ettringite

Reference List:Lehmann, J. (1874): "Über den Ettringit, ein neues Mineral in Kalkeinschlüssen der Lava von Ettringen (Laacher Gebiet)", N. Jb. Mineral. Geol. Paläont., 273-275.

Moses (1893) American Journal of Science: 45: 489.

Brauns, R.A. (1922) Die Mineralien der niederrheinischen Vulkangebiete. 225pp., 4to, Stuttgart: 173.

Bannister (1936) Mineralogical Magazine: 24: 324.

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.: 589-590.

McConnell, Duncan & Joseph Murdoch (1962), Crystal chemistry of ettringite Mineralogical Magazine: 33: 59-64.

Internet Links for Ettringite

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    Localities for Ettringite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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.
    Austria
     
    • Styria
      • Bad Radkersburg
        • Klöch
    		Postl, W. & Walter, F. (1983); R. Exel: Die Mineralien und Erzlagerstätten Österreichs, 1993
    • Tyrol
      • North Tyrol
        • Inn valley
          • Brixlegg - Schwaz area
            • Brixlegg - Rattenberg
              • St Gertraudi
    		Lapis 19 (7/8):69 (1994)
    Belgium
     
    • Limburg Province
      • Dilsen-Stokkem
    • Namur Province
      • Andenne
    		No reference listed
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Clermont-Ferrand
          • Ceyrat
    		H. Grünhagen and J. Mergoil, Bull. Soc. Franç. Minér. Crist. , 1963, LXXXVI, pp. 149-157.
    • Midi-Pyrénées
      • Aveyron
        • Espalion
    		Boutry C., Pelisson P., Pillard F. (1986), Les zéolites d'Espalion, Le Cahier des Micromonteurs, n°2, pp: 3-7
    Eytier J.R. & Ch., Favreau G., Devouard B., Vigier J. (2004), Minéraux de pyrométamorphisme de Lapanouse-de Sévérac (Aveyron), Cahier des Micromonteurs, n°85, pp: 3-58
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Wolfach
          • Oberwolfach
            • Rankach valley
    		K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
    • Bavaria
      • Franconia
        • Maroldsweisach
    		Pöllmann, H. (1991): Die Afwillit-Portlandit Paragenese im Basalt des Zeilbergs bei Maroldsweisach/Unterfranken. Aufschluss, 42, 257-266
    • Hesse
      • North Hesse
        • Richelsdorf District
          • Süss
            • Richelsdorf Smelter
    		S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • North Rhine-Westphalia
      • Aachen
        • Eschweiler
        • Stolberg
    International Association of Collectors of Slag
      • Sauerland
        • Arnsberg
          • Hüsten
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Rhineland-Palatinate
      • Eifel Mts
        • Daun
          • Hinterweiler
    		Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
          • Üdersdorf
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
        • Hillesheim
          • Zilsdorf
    		No reference listed
        • Mayen
          • Ettringen
    		Lehmann, J., Über den Ettringit, ein neues Mineral, in Kalkeinschlüssen der Lava von Ettringen (Laacher Gebiet). N. Jb. Mineral. Geol. Paläont., 273-275, 1874; 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: 590.
        • Mendig
          • Bell
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
          • Niedermendig
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
        • Niederzissen
          • Brenk
    		Hentschel, G., Ettringit vom Schellkopf bei Brenk in der Eifel, Der Aufschluss, 19, 198-200, 1968
      • Lahn valley
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Thuringia
      • Gera
        • Ronneburg U deposit
    		T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District slag localities
          • Passa Limani area
    		Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals of the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Sounion area
    		Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Thorikos area
    		Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Vrissaki area
    		Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
    Israel
     
    Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
          • Monte Somma
            • Ercolano
              • San Vito
    		Russo, M., Punzo, I. (2004): I minerali del Somma-Vesuvio, AMI
    • Latium
      • Rome Province
    		Caponera, I., Fiori, S., Pucci, R., & Signoretti, E. (2007). I minerali dei Colli Albani. Un aggiornamento sugli ultimi dieci anni di ricerche. Rivista Mineralogica Italiana, 31 (2), 74-91.
        • Rome
          • Vallerano
      • Viterbo Province
        • Montalto di Castro
          • Pietra Massa Locality
    		Passaglia, E. & Turconi, B. (1982): Silicati ed altri minerali di Montalto di Castro - VT. Rivista Mineralogica Italiana, 4/1982, 97-110.
    • Tuscany
      • Livorno Province
        • Piombino
    		Franzini & Perchiazzi, 1992. I minerali delle scorie ferrifere di Baratti (Livorno). Atti Soc. Tosc. Sci. Nat., Mem., Serie A: 43-77
    • Veneto
      • Vicenza Province
    		Lapis, 15 (12), 27-32+50.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
    		Matsuyama, F. (2001)
    Jordan
     
    • Amman
      • Hashem region
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    http://www.natural-analogues.com/maqarin.htm
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • Verkhnechegemskiy volcanic structure
    		A. E. Zadov data
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Hotazel
    		[Von Bezing, K. L. et al. (1991) - The Kalahari (Afrique du Sud) manganese field : an update, Mineralogical Record, 22 (3), 279-302.]
    [Von Bezing, K. L. et al. (1991) - The Kalahari manganese field : an update, Mineralogical Record, 22 (3), 279-302]
        • N'Chwaning Mines
    		No reference listed
    Minerals of South Africa + Hochleitner, R. (1986). Sturmanit und Ettringit aus den Kalahari-Manganfeldern. LAPIS 11 (10), 19-24
    UK
     
    • England
      • Cornwall
        • Camborne - Redruth - St Day District
          • Lanner (Lannarth)
      • Derbyshire
        • Ashover
          • Milltown
    		[Rust, S. Seltene Mineralien aus dem Steinbruch Milltown bei Ashover LAPIS Mineralienmagazin 1994, 12, p.13-17, 58]
    • Northern Ireland
      • Co. Antrim
        • Larne
    		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: 590.
    USA
     
    • Arizona
      • Cochise Co.
        • Tombstone District
          • Tombstone
    		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: 590; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 217; Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, AZ, AZ Bur. Mines Bull. 143.
    • California
      • Riverside Co.
        • Crestmore
          • Crestmore quarries
            • Sky Blue Hill
    		No reference listed
    • Vermont
      • Windham Co.
        • Putney
    		Rocks & Min. vol. 71, (1996)
    Minerals of Virginia 1990 by R. V. Dietrich
      • Highland Co.
    		Minerals of Virginia, 1990 by R. V. Dietrich
    Mineral and/or Locality
    Google
     
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