Svyazhinite Mineral Data

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.

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:

TriclinicSpace 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

Diaphaniety:

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

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:

r_electron=1.75 gm/cc
note: r_Svyazhinite=1.67 gm/cc.

Fermion Index

Fermion Index = 0.00599
Boson Index = 0.99401

Photoelectric:

PE_Svyazhinite= 1.16 barns/electron
U=PE_Svyazhinite x r_electron= 2.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Svyazhinite is Not Radioactive

Svyazhinite Classification

Dana Class:

31.9.8.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.8)Dana Group

31.9.8.1 Aubertite CuAl(SO4)2Cl·14(H2O) P1 1

31.9.8.2 Svyazhinite MgAl(SO4)2F·14(H2O) P1,P 1 Tri

31.9.8.3 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl·14(H2O) P1 1

Strunz Class:

VI/D.07-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.07 - Wilcoxite - Aubertite series

VI/D.07-10 Wilcoxite MgAl(SO4)2F·18(H2O) P 1,P1 Tri

VI/D.07-20 Svyazhinite MgAl(SO4)2F·14(H2O) P1,P 1 Tri

VI/D.07-30 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl·14(H2O) P1 1

VI/D.07-40 Aubertite CuAl(SO4)2Cl·14(H2O) P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Svyazhinite

MgAl(SO4)2F·14(H2O)
Dana No: 31.9.8.2 Strunz No: VI/D.07-20
Locality:

Notes: