Hydroglauberite
A valid IMA mineral species
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About Hydroglauberite
Formula:
Na10Ca3(SO4)8 · 6H2O
Colour:
White
Lustre:
Silky
Specific Gravity:
1.510
Crystal System:
Monoclinic
Name:
Named for its chemical similarity to glauberite, with essential water.
An uncommon alteration product of glauberite.
Chemically related to eugsterite, antofagastaite, omongwaite, and partially to cesanite.
Chemically related to eugsterite, antofagastaite, omongwaite, and partially to cesanite.
Unique Identifiers
Mindat ID:
1973
Long-form identifier:
mindat:1:1:1973:2
IMA Classification of Hydroglauberite
Approved
IMA Formula:
Na10Ca3(S6+O4)8·6H2O
Approval year:
1968
First published:
1969
Classification of Hydroglauberite
7.CD.20
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
29.4.1.1
29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
25.4.7
25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hglb | 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 Hydroglauberite
Silky
Transparency:
Translucent
Comment:
Silky when in aggregates
Colour:
White
Streak:
White
Cleavage:
Distinct/Good
Three noted, one of which is parallel to elongation
Three noted, one of which is parallel to elongation
Density:
1.510 g/cm3 (Measured)
Optical Data of Hydroglauberite
Type:
Biaxial (-)
RI values:
nα = 1.488 nγ = 1.500
Max. Birefringence:
δ = 0.012
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
weak
Chemistry of Hydroglauberite
Mindat Formula:
Na10Ca3(SO4)8 · 6H2O
Element Weights:
Crystallography of Hydroglauberite
Crystal System:
Monoclinic
Morphology:
felted aggregates of fibrous crystals, dense masses
Comment:
Point Group: n.d.; Space Group: n.d. Z = n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.08 Å | (100) |
| 9.20 Å | (90) |
| 2.78 Å | (90b) |
| 4.60 Å | (80) |
| 2.90 Å | (70) |
| 4.20 Å | (60) |
| 3.52 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] |
Type Occurrence of Hydroglauberite
General Appearance of Type Material:
Dense, snow-white masses; appears as fibers under magnification
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, numbers 72170, 72171.
Smithsonian (National Museum of Natural History), Washington, D.C., USA, number 148423.
Smithsonian (National Museum of Natural History), Washington, D.C., USA, number 148423.
Associated Minerals at Type Locality:
Synonyms of Hydroglauberite
Other Language Names for Hydroglauberite
Dutch:Hydroglauberiet
German:Hydroglauberit
Simplified Chinese:水钙芒硝
Spanish:Hydroglauberita
Traditional Chinese:水鈣芒硝
Common Associates
Associations Based on Photo Data:
| 11 photos of Hydroglauberite associated with Glauberite | Na2Ca(SO4)2 |
| 9 photos of Hydroglauberite associated with Gypsum | CaSO4 · 2H2O |
| 4 photos of Hydroglauberite associated with Andersonite | Na2Ca(UO2)(CO3)3 · 5.33H2O |
Related Minerals - Strunz-mindat Grouping
| 7.CD. | Argesite | (NH4)7Bi3Cl16 |
| 7.CD. | Campostriniite | (Bi3+,Na)3(NH4,K)2Na2(SO4)6 · H2O |
| 7.CD.05 | Matteuccite | NaHSO4 · H2O |
| 7.CD.10 | Mirabilite | Na2SO4 · 10H2O |
| 7.CD.15 | Lecontite | (NH4)Na(SO4) · 2H2O |
| 7.CD.25 | Eugsterite | Na4Ca(SO4)3 · 2H2O |
| 7.CD.30 | Görgeyite | K2Ca5(SO4)6 · H2O |
| 7.CD.35 | Syngenite | K2Ca(SO4)2 · H2O |
| 7.CD.35 | Antofagastaite | Na2Ca(SO4)2 · 1.5H2O |
| 7.CD.35 | Koktaite | (NH4)2Ca(SO4)2 · H2O |
| 7.CD.40 | Gypsum | CaSO4 · 2H2O |
| 7.CD.45 | Chinleite-(Y) | NaY(SO4)2 · H2O |
| 7.CD.45 | Bassanite | Ca(SO4) · 0.5H2O |
| 7.CD.45 | Chinleite-(Nd) | NaNd(SO4)2 · H2O |
| 7.CD.45 | Chinleite-(Ce) | NaCe(SO4)2(H2O) |
| 7.CD.50 | Zircosulfate | (Zr,Ti)(SO4)2 · 4H2O |
| 7.CD.55 | Schieffelinite | Pb10Te6+6O20(OH)14(SO4)(H2O)5 |
| 7.CD.60 | Montanite | Bi2(TeO6) · nH2O |
| 7.CD.65 | Omongwaite | Na2Ca5(SO4)6 · 3H2O |
Other Information
Notes:
Tastes salty, slightly bitter.
Decomposed by H2O to form gypsum.
Easily dissolved by dilute HCl.
Decomposed by H2O to form gypsum.
Easily dissolved by dilute HCl.
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 Hydroglauberite
mindat.org URL:
https://www.mindat.org/min-1973.html
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Please feel free to link to this page.
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External Links:
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References for Hydroglauberite
Reference List:
Localities for Hydroglauberite
Showing 19 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Ovejero Toledo et al. (2009) |
Australia | |
| R. Bottrill |
Canada | |
| Last (1990) |
China | |
| Zheng et al. (2005) |
| Mianping Zheng and Xifang Liu (2010) |
| Shaoxiu (1991) |
| Xiyu Zheng and Shengsong Yu (1981) +1 other reference | |
| Xiyu Zheng and Shengsong Yu (1981) +2 other references |
| Jihe Dong and Bingxiao Li (1981) | |
Czech Republic | |
| Matýsek et al. (2026) |
Germany | |
| Weiß (1990) |
| Hentschel (2014) +1 other reference |
Japan | |
| Seki et al. (1987) |
Spain | |
| Calvo Rebollar (2014) |
Switzerland | |
| Musée Cantonale de Géologie de ... |
USA | |
| Kampf et al. (2019) +1 other reference |
| Sorrell (n.d.) |
| Jensen et al. (2012) |
Uzbekistan (TL) | |
| Slyusareva (1969) +1 other reference |
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Apex Mine, Reese River Mining District, Lander County, Nevada, USA