Eugsterite (original) (raw)
A valid IMA mineral species
About EugsteriteHide
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Formula:
Na4Ca(SO4)3 · 2H2O
Crystal System:
Monoclinic
Name:
Named in 1981 by Lideke Vergouwen in honour of Hans-Peter Eugster (19 November 1925, Igis, Landquart, Grisons, Switzerland – 17 December 1987, Baltimore, Maryland, USA), geochemist at Johns Hopkins University, Baltimore, Maryland, USA.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1423:2
10e212bd-c57e-4b8a-b13d-c4e5875ba8bc
IMA Classification of EugsteriteHide
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Type description reference:
Classification of EugsteriteHide
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7.CD.25
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
29.4.2.1
29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
25.4.6
25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Egt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of EugsteriteHide
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Comment:
Could not be mesured due to its sticky nature
Optical Data of EugsteriteHide
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RI values:
_n_α = 1.492 _n_γ = 1.496
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of EugsteriteHide
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Mindat Formula:
Na4Ca(SO4)3 · 2H2O
Crystallography of EugsteriteHide
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Crystal System:
Monoclinic
Comment:
Monoclinic (?). Point Group: n.d.; Space Group: n.d. a = n.d. b = n.d. c = n.d. β = 116◦ Z = n.d.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.20 Å | (39) |
| 5.50 Å | (64) |
| 4.50 Å | (33) |
| 3.454 Å | (32) |
| 3.428 Å | (100) |
| 2.763 Å | (25) |
| 2.746 Å | (46) |
| 1.7126 Å | (61) |
Geological EnvironmentHide
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Geological Setting:
salt pans
Type Occurrence of EugsteriteHide
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General Appearance of Type Material:
fibers have a thickness of 0.5-1.5 μm and they are up to 40 μm long
Place of Conservation of Type Material:
National Museum of Geology and Mineralogy, Hooglandse Kerkgracht 17, Leiden. the Netherlands
Geological Setting of Type Material:
Efforvescences in salt pans
Associated Minerals at Type Locality:
Reference:
Vergouwen, L. (1981) Eugsterite, a new salt mineral. American Mineralogist: 66: 632-636.
Synonyms of EugsteriteHide
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Other Language Names for EugsteriteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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 EugsteriteHide
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References for EugsteriteHide
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Localities for EugsteriteHide
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This 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.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.