Blödite
A valid IMA mineral species - grandfathered
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About Blödite
Formula:
Na2Mg(SO4)2 · 4H2O
May contain some K replacing Na.
Colour:
Colourless, bluish-green, reddish; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
2½ - 3
Specific Gravity:
2.218 - 2.24
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Carl (Karl) August Blöde (14 August 1773, Freiberg Saxony, Germany - 28 August 1820) German Privy Financial Councilor, chemist and author. The variant spelling bloedite was rejected by the IMA in 1960.
Unique Identifiers
Mindat ID:
695
Long-form identifier:
mindat:1:1:695:8
GUID
(UUID V4):
(UUID V4):
8f43c227-a440-4c27-b3d2-35735d04f988
Classification of Blödite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1821
Type description reference:
7.CC.50
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.3.3.1
29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.3.9
25 : Sulphates
3 : Sulphates of Mg
25 : Sulphates
3 : Sulphates of Mg
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 |
---|---|---|
Blö | 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 Blödite
Vitreous
Transparency:
Transparent
Colour:
Colourless, bluish-green, reddish; colourless in transmitted light.
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.218 - 2.24 g/cm3 (Measured) 2.23 g/cm3 (Calculated)
Optical Data of Blödite
Type:
Biaxial (-)
RI values:
nα = 1.483 nβ = 1.486 nγ = 1.487
2V:
Measured: 71° , Calculated: 58°
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Chemical Properties of Blödite
Formula:
Na2Mg(SO4)2 · 4H2O
May contain some K replacing Na.
May contain some K replacing Na.
Crystallography of Blödite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 11.04 Å, b = 8.15 Å, c = 5.49 Å
β = 100.41°
β = 100.41°
Ratio:
a:b:c = 1.355 : 1 : 0.674
Unit Cell V:
485.84 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals short prismatic [001], frequently highly modified. Massive, granular or compact.
Crystallographic forms of Blödite
Crystal Atlas:
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X-Ray Powder Diffraction
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Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.252 Å | (100) |
4.555 Å | (95) |
3.289 Å | (95) |
2.971 Å | (40) |
2.732 Å | (40) |
4.281 Å | (30) |
2.025 Å | (30) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) | |
Stage 7: Great Oxidation Event | <2.4 |
45a : [Sulfates, arsenates, selenates, antimonates] | |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Geological Setting:
Oceanic salt deposits; lacustrine salt deposits; nitrate deposits in arid regions.
Type Occurrence of Blödite
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Oceanic salt deposit.
Associated Minerals at Type Locality:
Reference:
John, J.F. (1821) Chemische Zerlegung eines neuen fossilen Salzes, des Blödits. in Chemische Untersuchungen mineralischer, vegetabilischer und animalischer Substanzen, Maurerschen Buchhandlung (Berlin): 240-247.
Synonyms of Blödite
Other Language Names for Blödite
Italian:Bloedite
Russian:Бледит
Simplified Chinese:白钠镁矾
Spanish:Astrachanita
Astrakhanita
Blödita
Astrakhanita
Blödita
Traditional Chinese:白鈉鎂礬
Varieties of Blödite
Natronkalisimonyit | A variety containing a small amount of K (0.43%) |
Relationship of Blödite to other Species
Member of:
Other Members of this group:
Changoite | Na2Zn(SO4)2 · 4H2O | Mon. 2/m : P21/b |
Cobaltoblödite | Na2Co(SO4)2 · 4H2O | Mon. 2/m : P21/b |
Manganoblödite | Na2Mn(SO4)2 · 4H2O | Mon. 2/m : P21/b |
Nickelblödite | Na2(Ni,Mg)(SO4)2 · 4H2O | Mon. 2/m : P21/b |
Common Associates
Associated Minerals Based on Photo Data:
6 photos of Blödite associated with Betpakdalite-NaCa | [Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3] |
6 photos of Blödite associated with Hexahydrite | MgSO4 · 6H2O |
6 photos of Blödite associated with Nitratine | NaNO3 |
6 photos of Blödite associated with Bandylite | Cu[B(OH)4]Cl |
2 photos of Blödite associated with Thénardite | Na2SO4 |
2 photos of Blödite associated with Konyaite | Na2Mg(SO4)2 · 5H2O |
1 photo of Blödite associated with Tamarugite | NaAl(SO4)2 · 6H2O |
1 photo of Blödite associated with Sideronatrite | Na2Fe(SO4)2(OH) · 3H2O |
1 photo of Blödite associated with Polyhalite | K2Ca2Mg(SO4)4 · 2H2O |
1 photo of Blödite associated with Picromerite | K2Mg(SO4)2 · 6H2O |
Related Minerals - Strunz-mindat Grouping
7.CC. | Cobaltoblödite | Na2Co(SO4)2 · 4H2O |
7.CC. | Andychristyite | PbCu2+Te6+O5(H2O) |
7.CC. | Ammoniovoltaite | (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18 |
7.CC.05 | Krausite | KFe(SO4)2 · H2O |
7.CC.10 | Tamarugite | NaAl(SO4)2 · 6H2O |
7.CC.15 | Kalinite | KAl(SO4)2 · 11H2O |
7.CC.15 | Mendozite | NaAl(SO4)2 · 11H2O |
7.CC.20 | Lonecreekite | (NH4)Fe3+(SO4)2 · 12H2O |
7.CC.20 | Alum-(K) | KAl(SO4)2 · 12H2O |
7.CC.20 | Alum-(Na) | NaAl(SO4)2 · 12H2O |
7.CC.20 | Tschermigite | (NH4)Al(SO4)2 · 12H2O |
7.CC.20 | Lanmuchangite | Tl+Al(SO4)2 · 12H2O |
7.CC.25 | Voltaite | K2Fe2+5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Zincovoltaite | K2Zn5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Pertlikite | K2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2O |
7.CC.25 | Ammoniomagnesiovoltaite | (NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Magnesiovoltaite | K2Mg5Fe3+3Al(SO4)12 · 18H2O |
7.CC.30 | Kröhnkite | Na2Cu(SO4)2 · 2H2O |
7.CC.35 | Ferrinatrite | Na3Fe(SO4)3 · 3H2O |
7.CC.40 | Goldichite | KFe(SO4)2 · 4H2O |
7.CC.45 | Löweite | Na12Mg7(SO4)13 · 15H2O |
7.CC.50 | Nickelblödite | Na2(Ni,Mg)(SO4)2 · 4H2O |
7.CC.50 | Changoite | Na2Zn(SO4)2 · 4H2O |
7.CC.55 | Leonite | K2Mg(SO4)2 · 4H2O |
7.CC.55 | Mereiterite | K2Fe(SO4)2 · 4H2O |
7.CC.60 | Boussingaultite | (NH4)2Mg(SO4)2 · 6H2O |
7.CC.60 | Cyanochroite | K2Cu(SO4)2 · 6H2O |
7.CC.60 | Mohrite | (NH4)2Fe(SO4)2 · 6H2O |
7.CC.60 | Nickelboussingaultite | (NH4)2Ni(SO4)2 · 6H2O |
7.CC.60 | Picromerite | K2Mg(SO4)2 · 6H2O |
7.CC.60 | Nickelpicromerite | K2Ni(SO4)2 · 6H2O |
7.CC.60 | Katerinopoulosite | (NH4)2Zn(SO4)2 · 6H2O |
7.CC.65 | Polyhalite | K2Ca2Mg(SO4)4 · 2H2O |
7.CC.70 | Leightonite | K2Ca2Cu(SO4)4 · 2H2O |
7.CC.75 | Amarillite | NaFe(SO4)2 · 6H2O |
7.CC.80 | Konyaite | Na2Mg(SO4)2 · 5H2O |
7.CC.85 | Wattevilleite | Na2Ca(SO4)2 · 4H2O (?) |
7.CC.85 | Xocolatlite | Ca2Mn4+2(Te6+O6)2 · H2O |
7.CC.90 | Eckhardite | (Ca,Pb)Cu2+Te6+O5(H2O) |
Other Information
Thermal Behaviour:
dehydration, endothermic, occurs at 380 and 500 K; first product is löweite; at the second step this transforms into α-Na2Mg2(SO4)3 and vanthoffite or thénardite; the α-Na2Mg2(SO4)
Notes:
Readily soluble in cold 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.
Internet Links for Blödite
mindat.org URL:
https://www.mindat.org/min-695.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Blödite
Reference List:
Localities for Blödite
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).
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.
All localities listed without proper references should be considered as questionable.
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Salt mine, Hallstatt, Gmunden District, Upper Austria, Austria