Svyazhinite Mineral Data

General Svyazhinite Information

Chemical Formula:

MgAl(SO4)2F•14(H2O)

Composition:

Molecular Weight = 514.63 gm

Magnesium 4.72 % Mg 7.83 % MgO

Aluminum 5.24 % Al 9.91 % Al₂O₃

Hydrogen 5.48 % H 49.01 % H₂O

Sulfur 12.46 % S 31.12 % SO₃

Oxygen 68.40 % O

Fluorine 3.69 % F 3.69 % F

- % F -1.55 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgAl(SO₄)₂F•14(H₂O)

Environment:

Associated with pyrite and fluorite and in fractures cutting pyroxene-amphibole fenites.

IMA Status:

Approved IMA 1984

Locality:

Ilmeniskie Mountains, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Nikolai Vasilevich Svyazhin (1927-1967), Russian mineralogist.

Name Pronunciation:

Svyazhinite + Pronunciation

Svyazhinite Image

Images:

Svyazhinite

Comments: Granular svyazhinite aggregate.
Location: Chelyabinsk Coal Basin, Kopeisk, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Svyazhinite Crystallography

Axial Ratios:

a:b:c =0.4672:1:0.47

Cell Dimensions:

a = 6.217, b = 13.306, c = 6.255, Z = 1; alpha = 90.09°, beta = 93.5°, gamma = 82.05° V = 511.51 Den(Calc)= 1.67

Crystal System:

Triclinic Space Group: P1,P 1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.91(1), 5.68(0.7), 4.4(0.5),

Physical Properties of Svyazhinite

Color:

Colorless, Gray white, Yellow.

Density:

1.69

Diaphaneity:

Transparent

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Svyazhinite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2607,KPDmeas= 0.2576,KC= 0.2596
Ncalc = 1.43 - 1.44

Optical Data:

Biaxial (-), a=1.423, b=1.439, g=1.444, bire=0.0210, 2V(Calc)=56, 2V(Meas)=small.

Calculated Properties of Svyazhinite

Electron Density:

Bulk Density (Electron Density)=1.75 gm/cc
note: Specific Gravity of Svyazhinite =1.67 gm/cc.

Fermion Index:

Fermion Index = 0.0059940163
Boson Index = 0.9940059837

Photoelectric:

PE_Svyazhinite= 1.16 barns/electron
U=PE_Svyazhinite x rElectron Density= 2.04 barns/cc.

Radioactivity:

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

Svyazhinite Classification

Dana Class:

31.09.08.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zqï¿½x(H2O)

(31.09.08)Aubertite Group

31.09.08.01 Aubertite CuAl(SO4)2Cl•14(H2O) P1 1

31.09.08.02 Svyazhinite MgAl(SO4)2F•14(H2O) P1,P 1 Tri

31.09.08.03 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl•14(H2O) P1 1

Strunz Class:

07.DB.05 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DB -With only medium-sized cations; insular octahedra and finite groups

07.DB.05 Aubertite CuAl(SO4)2Cl•14(H2O) P1 1

07.DB.05 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl•14(H2O) P1 1

07.DB.05 Svyazhinite MgAl(SO4)2F•14(H2O) P1,P 1 Tri

Other Svyazhinite 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 Svyazhinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Svyazhinite

MgAl(SO4)2F•14(H2O)
Dana No: 31.09.08.02 Strunz No: 07.DB.05
Locality:

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