Blodite Mineral Data

General Blodite Information

Chemical Formula:

Na2Mg(SO4)2•4(H2O)

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

Empirical Formula:

Na₂Mg(SO₄)₂•4(H₂O)

Environment:

Marine evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1821

Locality:

Ischel deposit in Austria. Link to MinDat.org Location Data.

Name Origin:

Named for Carl August Bloede (1773-1820), German chemist.

Name Pronunciation:

Blodite

Synonym:

Bloedite

Zincblï¿½dite - name used for artificial compound.

Blodite Image

Images:

Blodite Tamarugite

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

Blodite Crystallography

Axial Ratios:

a:b:c =1.3499:1:0.672

Cell Dimensions:

a = 11.126, b = 8.242, c = 5.539, Z = 2; beta = 100.84° V = 498.87 Den(Calc)= 2.23

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/I_o): 3.25(1), 3.29(0.95), 4.56(0.95),

Physical Properties of Blodite

Color:

Colorless, Green, Yellow, Red.

Density:

2.23

Diaphaneity:

Transparent to translucent

Habit:

Compact - Occurs as a compact mass.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Optical Properties of Blodite

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

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

Electron Density:

Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Blodite =2.23 gm/cc.

Fermion Index:

Fermion Index = 0.0089838563
Boson Index = 0.9910161437

Photoelectric:

PE_Blodite= 1.59 barns/electron
U=PE_Blodite x rElectron Density= 3.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Blodite is Not Radioactive

Blodite Classification

Dana Class:

29.03.03.01 (29)Hydrated Acid and Sulfates

(29.03)where (A+)2 B (XO4)2 ï¿½ x(H2O)

(29.03.03)Blodite Group

29.03.03.01 Blodite Na2Mg(SO4)2•4(H2O) P 2₁/a 2/m

29.03.03.02 Nickelblodite Na2(Ni,Mg)(SO4)2•4(H2O) P 2₁/a 2/m

29.03.03.03 Leonite K2Mg(SO4)2•4(H2O) C 2/m 2/m

29.03.03.04 Mereiterite! K2Fe(SO4)2•4(H2O) C 2/m 2/m

29.03.03.05 Changoite! Na2Zn(SO4)2•4(H2O) P 2₁/a 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
14 - WWW-MINCRYST

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Print or Cut-and-Paste your Blodite Specimen Label here :

Blodite

Na2Mg(SO4)2•4(H2O)
Dana No: 29.03.03.01 Strunz No: 07.CC.50
Locality:

Notes:

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