Mineralogy Database

Blodite Mineral Data

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General Blodite Information

Help on Chemical  Formula: Chemical Formula: Na2Mg(SO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 334.47 gm
   Sodium     13.75 %  Na   18.53 % Na2O
   Magnesium   7.27 %  Mg   12.05 % MgO
   Hydrogen    2.41 %  H    21.54 % H2O
   Sulfur     19.17 %  S    47.87 % SO3
   Oxygen     57.40 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Mg(SO4)2•4(H2O)
Help on Environment: Environment: Marine evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1821
Help on Locality: Locality: Ischel deposit in Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Carl August Bloede (1773-1820), German chemist.
Help on Name Pronunciation: Name Pronunciation: Blodite Say BLODITE
Help on Synonym: Synonym: Bloedite
  Zincbl�dite - name used for artificial compound.

Blodite Image

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  Blodite   Tamarugite

Comments: Clear, yellow blödite with white tamarugite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Blodite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3499:1:0.672
Help on Cell Dimensions: Cell Dimensions: a = 11.126, b = 8.242, c = 5.539, Z = 2; beta = 100.84° V = 498.87 Den(Calc)= 2.23
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.25(1), 3.29(0.95), 4.56(0.95),

Physical Properties of Blodite

Help on Color: Color: Colorless, Green, Yellow, Red.
Help on Density: Density: 2.23
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Compact - Occurs as a compact mass.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.

Optical Properties of Blodite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2176,KPDmeas= 0.2176,KC= 0.2173
Ncalc = 1.48
Help on Optical Data: Optical Data: Biaxial (-), a=1.483, b=1.486, g=1.487, bire=0.0040, 2V(Calc)=58, 2V(Meas)=71. Dispersion relatively strong.

Calculated Properties of Blodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Blodite =2.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089838563
Boson Index = 0.9910161437
Help on Photoelectric: Photoelectric: PEBlodite = 1.59 barns/electron
U=PEBlodite x rElectron Density= 3.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Blodite is Not Radioactive

Blodite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 � x(H2O)
  (29.03.03)Blodite Group Blodite Na2Mg(SO4)2•4(H2O) P 21/a 2/m Nickelblodite Na2(Ni,Mg)(SO4)2•4(H2O) P 21/a 2/m Leonite K2Mg(SO4)2•4(H2O) C 2/m 2/m Mereiterite! K2Fe(SO4)2•4(H2O) C 2/m 2/m Changoite! Na2Zn(SO4)2•4(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 07.CC.50 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
07.CC.50 Blodite Na2Mg(SO4)2•4(H2O) P 21/a 2/m
07.CC.50 Changoite! Na2Zn(SO4)2•4(H2O) P 21/a 2/m
07.CC.50 Nickelblodite Na2(Ni,Mg)(SO4)2•4(H2O) P 21/a 2/m

Other Blodite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Blodite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 07.CC.50





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