Shafranovskite Mineral Data

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General Shafranovskite Information

Chemical Formula:

K2Na3(Mn++,Fe++,Na)4[Si9(O,OH)27](OH)2•n(H2O), n~2.33

Composition:

Molecular Weight = 1,051.58 gm

Potassium 6.62 % K 7.97 % K₂O

Sodium 5.47 % Na 7.37 % Na₂O

Calcium 0.15 % Ca 0.21 % CaO

Magnesium 0.09 % Mg 0.15 % MgO

Manganese 13.17 % Mn 17.00 % MnO

Aluminum 0.31 % Al 0.58 % Al₂O₃

Iron 3.35 % Fe 4.30 % FeO

Silicon 24.04 % Si 51.42 % SiO₂

Hydrogen 1.20 % H 10.74 % H₂O

Oxygen 45.61 % O

______ ______

100.00 % 99.76 % = TOTAL OXIDE

Empirical Formula:

Na_2.5K_1.78Mn²⁺_2.52Fe²⁺_0.63Ca_0.04Mg_0.046(Al_0.02)Si₉O_23.71·6.27(H₂O)

Environment:

Produced by late-stage crystallization of alkalic nepheline syenite magmas in pegmatites in differentiated alkalic massifs. Hydrous manganese phyllosilicate.

IMA Status:

Approved IMA 1982

Locality:

On Mts. Rasvumchorr, Niorkpakhk, Koashkar, and Koashva, Khibiny massif, and at the Jubilee pegmatite, Mt. Karnasurt, and several other localities in the Lovozero massif, Kola Peninsula Link to MinDat.org Location Data.

Name Origin:

Named for Ilarion Ilarionovich Shafranovskii (1907-1994), mineralogist and crystallographer at the Mining Institute, St. Petersburg, Russia.

Name Pronunciation:

Shafranovskite + Pronunciation

Shafranovskite Image

Images:

Shafranovskite

Comments: Yellow-brown fine grained shafranovskite with red eudialyte and black aegirine.
Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsular, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Shafranovskite Crystallography

Axial Ratios:

a:c = 1:1.45065

Cell Dimensions:

a = 14.519, c = 21.062, Z = 6; V = 3,845.07 Den(Calc)= 2.72

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁c

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

By Intensity(I/I_o): 10.54(1), 3.51(0.7), 2.787(0.6),

Crystal Structure:

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Krivovichev S V , Yakovenchuk V N , Armbruster T , Pakhomovsky Y A , Weber H-P , Depmeier W , American Mineralogist , 89 (2004) p.1816-1821, Synchrotron X-ray diffraction study of the structure of shafranovskite,, K2Na3(Mn,Fe,Na)4[Si9(O,OH)27].nH2O, a rare manganese silicate from Kola peninsula, Russia

Physical Properties of Shafranovskite

Cleavage:

{0001} Good

Color:

Yellow green, Yellow orange, Olive green.

Density:

2.76 - 2.78, Average = 2.76

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Shafranovskite

Dichroism (e):

pale yellow green.

Dichroism (w):

pale yellow green.

Gladstone-Dale:

CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2088,KC= 0.2166
Ncalc = 1.59 - 1.6

Optical Data:

Uniaxial (-), e=1.57, w=1.587, bire=0.0170.

Calculated Properties of Shafranovskite

Electron Density:

Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Shafranovskite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Shafranovskite}= 5.99 barns/electron
U=PE_{Shafranovskite} x r_electron= 16.17 barns/cc.

Radioactivity:

GRapi = 94.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Shafranovskite per GRapi unit = 1.06 (%)

Estimated Radioactivity from Shafranovskite - barely detectable

Shafranovskite Classification

Dana Class:

78.03.02.01 (78)Unclassified silicates

(78.03)possible cyclosilicates

(78.03.02)Dana Group

78.03.02.01 Shafranovskite K2Na3(Mn,Fe,Na)4[Si9(O,OH)27](OH)2•n(H2O),n~2.33 P 3₁c 3m

Strunz Class:

09.EE.65 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.65 Shafranovskite K2Na3(Mn,Fe,Na)4[Si9(O,OH)27](OH)2•n(H2O),n~2.33 P 3₁c 3m

09.EE.65 Zakharovite Na4Mn5Si10O24(OH)6•6(H2O) P 3₁m,P 3m1 3m

Other Shafranovskite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2, AmMin 89:1816) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Shafranovskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Shafranovskite

K2Na3(Mn++,Fe++,Na)4[Si9(O,OH)27](OH)2•n(H2O), n~2.33
Dana No: 78.03.02.01 Strunz No: 09.EE.65
Locality:

Notes: