Fedorite Mineral Data

Fedorite Mineral Data +

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General Fedorite Information

Chemical Formula:

KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O)

Composition:

Molecular Weight = 1,493.94 gm

Potassium 2.62 % K 3.15 % K₂O

Sodium 6.16 % Na 8.30 % Na₂O

Calcium 10.73 % Ca 15.01 % CaO

Aluminum 1.44 % Al 2.73 % Al₂O₃

Silicon 28.58 % Si 61.13 % SiO₂

Hydrogen 1.01 % H 9.04 % H₂O

Oxygen 48.19 % O

Fluorine 1.27 % F 1.27 % F

- % F -0.54 % -O=F₂

______ ______

100.00 % 100.11 % = TOTAL OXIDE

Empirical Formula:

KNa₄Ca₄Al_0.8Si_15.2O₃₆(OH)₃F·6(H₂O)

Environment:

In fine veinlets in a fenititzed sandstone.

IMA Status:

Approved IMA 1965

Locality:

On the Tur'yii Peninsula, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Evgraf Stepanovich Fedorov (1853-1919), eminent Russian crystallographer.

Synonym:

ICSD 20853

PDF 19-466

Fedorite Image

Images:

Fedorite Charoite

Comments: Tan crystalline platy fedorite in pale violet charoite.
Location: Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fedorite Crystallography

Axial Ratios:

a:b:c =0.5791:1:0.7921

Cell Dimensions:

a = 9.676, b = 16.706, c = 13.233, Z = 2; alpha = 93.35°, beta = 114.96°, gamma = 90.03° V = 1,935.98 Den(Calc)= 2.56

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1

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

By Intensity(I/I_o): 2.93(1), 2.97(0.9), 1.826(0.9),3.13(0.8), 6(0.8), 11.7(0.8), 4.21(0.7),

Crystal Structure:

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Mitchell R H , Burns P C , The Canadian Mineralogist , 39 (2001) p.769-777, The structure of fedorite: A re-appraisal, Locality: Turiy complex, Kola Peninsula, Russia

View Additional jPOWD Structure files for Fedorite
[1]

Physical Properties of Fedorite

Cleavage:

[001] Perfect

Color:

Colorless, Light red, Pearl white.

Density:

2.43 - 2.58, Average = 2.5

Diaphaniety:

Transparent

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fedorite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2061,KPDmeas= 0.2106,KC= 0.2176

Optical Data:

Biaxial (-), a=1.522, b=1.53, g=1.531, bire=0.0090, 2V(Calc)=38, 2V(Meas)=32. Dispersion r < v distinct.

Calculated Properties of Fedorite

Electron Density:

r_electron=2.52 gm/cc
note: r_Fedorite=2.51 gm/cc.

Fermion Index

Fermion Index = 0.01372
Boson Index = 0.98628

Photoelectric:

PE_Fedorite= 2.83 barns/electron
U=PE_Fedorite x r_electron= 7.12 barns/cc.

Radioactivity:

GRapi = 37.93 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Fedorite - barely detectable

Fedorite Classification

Dana Class:

73.1.3.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.1)with double layers

(73.1.3)Dana Group

73.1.3.1 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

Strunz Class:

VIII/H.34-28 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.34 - Gyrolite series

VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1

VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2

Other Fedorite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Fedorite

KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O)
Dana No: 73.1.3.1 Strunz No: VIII/H.34-28
Locality:

Notes: