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Blödite

A valid IMA mineral species - grandfathered
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About BlöditeHide

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.
Lower-hydrate counterpart of konyaite.

Compare UM2008-50-SO:HMgNa and uklonskovite.


Unique IdentifiersHide

Mindat ID:
695
Long-form identifier:
mindat:1:1:695:8
GUID
(UUID V4):
8f43c227-a440-4c27-b3d2-35735d04f988

Classification of BlöditeHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1821
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
29.3.3.1

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.3.9

25 : Sulphates
3 : Sulphates of Mg

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
BlöIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BlöditeHide

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 BlöditeHide

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.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of BlöditeHide

Formula:
Na2Mg(SO4)2 · 4H2O

May contain some K replacing Na.

Crystallography of BlöditeHide

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°
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 BlöditeHide

Crystal Atlas:
Image Loading
Click on an icon to view
Blödite no.1 - Goldschmidt (1913-1926)
Blödite no.4 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

Toggle
Edge Lines | Miller Indices | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 BlöditeHide

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 BlöditeHide

Other Language Names for BlöditeHide

Varieties of BlöditeHide

NatronkalisimonyitA variety containing a small amount of K (0.43%)

Relationship of Blödite to other SpeciesHide

Member of:
Other Members of this group:
ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
CobaltoblöditeNa2Co(SO4)2 · 4H2OMon. 2/m : P21/b
ManganoblöditeNa2Mn(SO4)2 · 4H2O Mon. 2/m : P21/b
NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2OMon. 2/m : P21/b

Common AssociatesHide

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 HexahydriteMgSO4 · 6H2O
6 photos of Blödite associated with NitratineNaNO3
6 photos of Blödite associated with BandyliteCu[B(OH)4]Cl
2 photos of Blödite associated with ThénarditeNa2SO4
2 photos of Blödite associated with KonyaiteNa2Mg(SO4)2 · 5H2O
1 photo of Blödite associated with TamarugiteNaAl(SO4)2 · 6H2O
1 photo of Blödite associated with SideronatriteNa2Fe(SO4)2(OH) · 3H2O
1 photo of Blödite associated with PolyhaliteK2Ca2Mg(SO4)4 · 2H2O
1 photo of Blödite associated with PicromeriteK2Mg(SO4)2 · 6H2O

Related Minerals - Strunz-mindat GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.Ammoniovoltaite(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18Iso. m3m (4/m 3 2/m) : Fd3c
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25MagnesiovoltaiteK2Mg5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig. 3 : R3
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m : B2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon. 2/m : B2/m
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m : P2/b
7.CC.60NickelpicromeriteK2Ni(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Katerinopoulosite(NH4)2Zn(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OMon. 2/m : B2/b
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.
7.CC.85XocolatliteCa2Mn4+2(Te6+O6)2 · H2OMon. 2/m : P2/m
7.CC.90Eckhardite(Ca,Pb)Cu2+Te6+O5(H2O)Mon. 2/m

Other InformationHide

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 BlöditeHide

References for BlöditeHide

Reference List:

Localities for BlöditeHide

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

- 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.
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • McMurdo Dry Valleys
        • Taylor Valley
      • Olympus Range
  • Western Antarctica
    • Thiel Mts.
Argentina
 
  • Mendoza Province
    • Malargüe Department
      • Malargüe District
Asia
 
Australia
 
  • Queensland
    • City of Mount Isa
      • Mount Isa
        • Mount Isa Mines
  • Western Australia
    • Wiluna Shire
Austria
 
  • Salzburg
    • Hallein District
      • Abtenau
        • Webing
      • Hallein
      • Scheffau am Tennengebirge
        • Grubach
          • Moosegg
  • Tyrol
    • Innsbruck-Land District
      • Absam
        • Hall valley
  • Upper Austria
    • Gmunden District
      • Bad Ischl
        • Perneck
      • Hallstatt
Canada
 
  • British Columbia
    • Clinton Mining Division
      • Clinton
    • Kamloops Mining Division
      • Ashcroft
        • Venables Valley
    • Osoyoos Mining Division
      • Osoyoos
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    • Fort Norman
  • Nova Scotia
    • Cape Breton Co.
  • Saskatchewan
Cape Verde
 
  • Sotavento Islands
    • Fogo Island
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Antofagasta
        • La Negra
      • Mejillones
        • Mejillones peninsula
      • Sierra Gorda
    • El Loa Province
      • Calama
        • Chuquicamata District
      • San Pedro de Atacama
        • Cordillera de la Sal
    • Tocopilla Province
      • María Elena
        • Oficina María Elena
        • Pedro de Valdivia
  • Tarapacá
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      • Oficina Victoria
China
 
  • Inner Mongolia
    • Alxa League (Alashan Prefecture)
      • Alxa Left Banner (Alashan Zuoqi)
  • Qinghai
    • Hainan
    • Haixi Mongol and Tibetan Autonomous Prefecture
      • Da Qaidam (Dachaidan Co.)
      • Mangnai City (Mangya Co.)
        • Lenghu Co.
  • Shandong
    • Tai'an
      • Daiyue District
        • Dawenkou depression
  • Shanxi
    • Yuncheng
      • Yanhu District
  • Tibet
    • Nagchu Prefecture (Naqu Prefecture)
      • Nyima Co. (Nima Co.)
  • Xinjiang
    • Akesu Prefecture
      • Aksu Co.
    • Bayin'gholin Autonomous Prefecture (Bayingolin Autonomous Prefecture; Bayinguoleng Autonomous Prefecture)
      • Ruoqiang Co. (Qakilik Co.; Chaqiliq Co.)
    • Bo'ertala Autonomous Prefecture (Börtala Autonomous Prefecture)
      • Jinghe Co. (Jing Co.)
    • Turpan
      • Gaochang District
      • Shanshan Co.
        • Kanggur-Xifengshan gold belt
    • Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
      • Tacheng Prefecture (Tarbaghatay Prefecture)
        • Hebukesai'er Co. (Hoboksar Co.; Kobuksar Co.; Qobuqsar Co.)
Costa Rica
 
  • Cartago Province
    • Oreamuno Canton
      • Irazú Volcano
Czech Republic
 
  • Moravian-Silesian Region
    • Karviná District
      • Orlová
El Salvador
 
  • Sonsonate Department
France
 
  • Hauts-de-France
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      • Lens
  • Nouvelle-Aquitaine
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      • Oloron-Sainte-Marie
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    • Tarn-et-Garonne
      • Montauban
        • Orgueil
Germany
 
  • Hesse
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      • Fulda
        • Neuhof
          • Giesel
      • Hersfeld-Rotenburg
        • Heringen
        • Phillippsthal
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    • Arnsberg
      • Herne
        • Baukau
  • Saxony-Anhalt
    • Salzlandkreis
      • Börde-Hakel
        • Westeregeln
      • Bördeaue
        • Tarthun
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  • Thuringia
    • Wartburg District
      • Krayenberggemeinde
Hungary
 
  • Heves County
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      • Recsk
Iceland
 
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India
 
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Italy
 
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Kenya
 
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Pakistan
 
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Peru
 
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Poland
 
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      • Radlin
Portugal
 
  • Aveiro
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Russia
 
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      • Tolbachik Volcanic field
        • Great Fissure eruption (Main Fracture)
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      • Inagli Massif
Spain
 
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Tajikistan
 
  • Sughd
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      • Altyn-Topkan ore field (Zarnisor ore field)
Tanzania
 
  • Mbeya Region
Turkey
 
  • Ankara Province
    • Beypazari District
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    • Karapınar District
  • Niğde Province
Turkmenistan
 
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Ukraine
 
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  • Ivano-Frankivsk Oblast
USA
 
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        • Marble Canyon
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        • Bertram siding
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        • Mullet Island
    • Inyo County
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      • Temblor Range
        • Carneros Rocks
        • Spellacy
    • Merced County
      • Laguna Seca Creek area
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        • Alamo Canyon
  • Colorado
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  • Hawaii
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      • Red Canyon Mining District
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  • Washington
    • Yakima County
      • Mount Adams
Uzbekistan
 
  • Karakalpakstan
    • Lower Amu Darya River (Amydar'ya)
 
Mineral and/or Locality  
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