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Eugsterite

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Big Photo

Pabellón de Pica, Caleta Chanabaya, Iquique Province, Tarapacá Region, Chile
© L.C. 2011

Show Eugsterite Photos (3)



Formula:
Na
 
4
Ca(SO
 
4
)
 
3
 · 2H
 
2
O
System:MonoclinicColour:Colorless
Hardness:1 - 2
Name:
Named in 1981 by Lideke Vergouwen in honor of Hans-Peter Eugster, geochemist at Johns Hopkins University, Baltimore, Maryland, USA.
This page provides mineralogical data about Eugsterite.

Classification of Eugsterite

IMA status:Approved
Strunz 8th edition ID:6/C.21-30
Nickel-Strunz 10th (pending) edition ID:7.CD.25

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
Dana 8th edition ID:29.4.2.1

29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
Hey's CIM Ref.:25.4.6

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

Co-type Localities:Luanda, Lake Victoria, Kenya
Sindo, Lake Victoria, Kenya
Karapinar, Great Konya Basin, Konya Province, Central Anatolia Region, Turkey
Place of Conservation of Type Material:National Museum, Leiden, Netherlands
Year of Discovery:1981
Geological Setting of type material:Efforvescences in salt pans
Associated Minerals at type locality:
ThenarditeHalite

Physical Properties of Eugsterite

Diaphaneity (Transparency):Transparent
Colour:Colorless
Hardness (Mohs):1 - 2

Crystallography of Eugsterite

Crystal System:Monoclinic
Morphology:Thin fibers

Optical Data of Eugsterite

Type:Biaxial
RI values: nα = 1.492 nγ = 1.496
Maximum Birefringence:δ = 0.004

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong

Chemical Properties of Eugsterite

Formula:
Na
 
4
Ca(SO
 
4
)
 
3
 · 2H
 
2
O
Essential elements:Ca, H, Na, O, S
All elements listed in formula:Ca, H, Na, O, S

Relationship of Eugsterite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.CD.05Matteuccite
NaHSO
 
4
 · H
 
2
O
7.CD.10Mirabilite
Na
 
2
SO
 
4
 · 10H
 
2
O
7.CD.15Lecontite
(NH
 
4
,K)NaSO
 
4
 · 2H
 
2
O
7.CD.20Hydroglauberite
Na
 
10
Ca
 
3
(SO
 
4
)
 
8
 · 6H
 
2
O
7.CD.30Görgeyite
K
 
2
Ca
 
5
(SO
 
4
)
 
6
 · H
 
2
O
7.CD.35Koktaite
(NH
 
4
)
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
7.CD.35Syngenite
K
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
7.CD.40Gypsum
CaSO
 
4
 · 2H
 
2
O
7.CD.45Bassanite
CaSO
 
4
 · 0.5H
 
2
O
7.CD.50Zircosulfate
(Zr,Ti)(SO
 
4
)
 
2
 · 4H
 
2
O
7.CD.55Schieffelinite
Pb
 
8
(TeO
 
4
)
 
5
(SO
 
4
)
 
3
 · 8H
 
2
O
7.CD.60Montanite
Bi
 
2
(TeO
 
6
) · 2H
 
2
O
7.CD.65Omongwaite
Na
 
2
Ca
 
5
(SO
 
4
)
 
6
 · 3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.4.1Anhydrite
CaSO
 
4
25.4.2Bassanite
CaSO
 
4
 · 0.5H
 
2
O
25.4.3Gypsum
CaSO
 
4
 · 2H
 
2
O
25.4.4Glauberite
Na
 
2
Ca(SO
 
4
)
 
2
25.4.5Cesanite
Na
 
3
Ca
 
2
(SO
 
4
)
 
3
(OH)
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
(SO
 
4
)O
 
12
25.4.13Ettringite
Ca
 
6
Al
 
2
(SO
 
4
)
 
3
(OH)
 
12
 · 26H
 
2
O
25.4.14Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
(SO
 
4
)
 
3
(OH)
 
12
 · 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 Eugsterite

Synonyms:
IMA1980-008
Other Languages:
German:Eugsterit
Spanish:Eugsterita

Other Information

Other Information:Soluble in water
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 Eugsterite

Reference List:

- +
American Mineralogist: 66: 632-636.

Internet Links for Eugsterite

Search Engines:
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    • External Links:
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  • Look for Eugsterite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Eugsterite details from Handbook of Mineralogy (PDF)
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    • Localities for Eugsterite

    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.
    Hide Locality List
    (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.
    Bolivia
     
    • Potosí Department
      • Sud Lípez Province
        • Pastos Grandes
    Chile
     
    • Tarapacá Region
      • Iquique Province
        • Caleta Chanabaya
    		SEM/EDAX analyzed - Hans Peter Bojar (main author of Ammineite)
    China
     
    • Xinjiang (Xinjiang-Uygur) Autonomous Region
      • Akesu (Aksu; Aqsu) Prefecture
        • Akesu (Aksu; Aqsu) Co.
    		Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
    Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
    Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
      • Aral (Ala'er) Co.
    		Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
      • Bayin'gholin (Bayingolin; Bayinguoleng) Autonomous Prefecture
        • Hoxud (Hoxut; Xoshut; Heshuo) Co.
    		Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
    Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
      • Tulufan (Turfan; Turpan) Prefecture
        • Tulufan (Turfan; Turpan) Co.
          • Turfan (Turpan) basin
    		Akihiko Okada, Sadayo Yabuki, and Congqiang Liu (1994): RIKEN Review 5, 3-4
    Japan
     
    • Kyushu Region
      • Kagoshima Prefecture
        • Kirishima City
          • Makizono
    		Kobayashi et al (2005) Koubutsu-Gakkai Kou'en-Youshi, 153.
    Kenya
     
    • Lake Victoria
    		Amer.Min.(1981) 66, 632-636
    Amer.Min.(1981) 66, 632-636
    • Rift Valley Province
      • Turkana District
    		Am Min 66:632-635
    Switzerland
     
    • Vaud (Waadt)
      • Bex
    		Musée Cantonale de Géologie de Lausanne - Bulletin d'Activité 2005
    Turkey
     
    • Central Anatolia Region
      • Konya Province
        • Great Konya Basin
    		Am. Min. 66 (1981), 632
    USA
     
    • California
      • Inyo Co.
        • Death Valley National Park
          • Death Valley
    		Econ Geol (1996) 91:622-635
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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