Fluoro-magnesio-arfvedsonite Mineral Data

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General Fluoro-magnesio-arfvedsonite Information

Chemical Formula:

NaNa2(Mg,Fe++)4Fe+++[Si8O22](F,OH)2

Composition:

Molecular Weight = 828.15 gm

Potassium 1.42 % K 1.71 % K₂O

Sodium 5.55 % Na 7.48 % Na₂O

Calcium 1.94 % Ca 2.71 % CaO

Magnesium 12.03 % Mg 19.95 % MgO

Aluminum 0.65 % Al 1.23 % Al₂O₃

Iron 4.72 % Fe 0.87 % FeO / 5.78 % Fe₂O₃

Silicon 26.79 % Si 57.32 % SiO₂

Hydrogen 0.10 % H 0.87 % H₂O

Oxygen 44.05 % O

Fluorine 2.75 % F 2.75 % F

- % F -1.16 % -O=F₂

______ ______

100.00 % 99.52 % = TOTAL OXIDE

Empirical Formula:

Na₂K_0.3Ca_0.4Mg_4.1Fe²⁺_0.1Fe³⁺_0.6Al_0.2Si_7.9O₂₂F_1.2(OH)_0.8

Environment:

Albite-microcline fenite in the contact zone of the Ilmen alkaline massif.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Ilmen-Vishnevye Mountains alkaline massif, south Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the fluorine-dominant member of magnesio-arfvedsonite.

Synonym:

IMA1998-056

Fluoro-magnesio-arfvedsonite Image

Images:

Fluoro-magnesio-arfvedsonite

Comments: Heavy mineral concentrate of small dark green fragments of fluoro-magnesio-arfvedsonite.
Location: Unknown. Scale: See Image.
© Rruff Database

Fluoro-magnesio-arfvedsonite Crystallography

Axial Ratios:

a:b:c =0.5446:1:0.2931

Cell Dimensions:

a = 9.81, b = 18.01, c = 5.28, Z = 2; beta = 103.8° V = 905.93 Den(Calc)= 3.04

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.129(1)(310), 8.42(0.34)(110), 2.804(0.28)(330),3.264(0.23)(240), 2.708(0.17)(151), 3.392(0.11)(041), 1.654(0.1)(511), 2.895(0.1)(510), 2.716(0.1)(331),

Physical Properties of Fluoro-magnesio-arfvedsonite

Cleavage:

{110} Perfect

Color:

Light gray.

Density:

3.09

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fluoro-magnesio-arfvedsonite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.206,KPDmeas= 0.2027,KC= 0.209
Ncalc = 1.64 - 1.65

Optical Data:

Biaxial (+), a=1.618, b=1.629, g=1.632, bire=0.0140, 2V(Calc)=54, 2V(Meas)=50-70. Dispersion r > v.

Calculated Properties of Fluoro-magnesio-arfvedsonite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Fluoro-magnesio-arfvedsonite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Fluoro-magnesio-arfvedsonite}= 3.19 barns/electron
U=PE_{Fluoro-magnesio-arfvedsonite} x r_electron= 9.61 barns/cc.

Radioactivity:

GRapi = 20.24 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluoro-magnesio-arfvedsonite per GRapi unit = 4.94 (%)

Estimated Radioactivity from Fluoro-magnesio-arfvedsonite - barely detectable

Fluoro-magnesio-arfvedsonite Classification

Dana Class:

66.01.03c.09a (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.03c)Group 4, the sodic amphiboles

66.01.03c.01 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.02 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.03 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m

66.01.03c.04 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m

66.01.03c.05 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.06 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.07 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.08 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03c.09 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03c.09a Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m

66.01.03c.09b Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m

66.01.03c.10 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.11 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m

66.01.03c.11a Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03c.11b Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03c.11c Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m

66.01.03c.12 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

66.01.03c.12a Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m

66.01.03c.12b Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m

66.01.03c.13 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

66.01.03c.14 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m

66.01.03c.15 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m

66.01.03c.16 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m

66.01.03c.17 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m

Strunz Class:

09.DE.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.25 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m

09.DE.25 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m

09.DE.25 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m

09.DE.25 Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.25 Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.25 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m

09.DE.25 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m

09.DE.25 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m

09.DE.25 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

09.DE.25 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m

09.DE.25 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m

09.DE.25 Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m

09.DE.25 Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m

09.DE.25 Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m

09.DE.25 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m

Other Fluoro-magnesio-arfvedsonite Information

References:

NAME( AmMin, Vol 86, p 1534) PHYS. PROP.(AmMin, Vol 86, p 1534) OPTIC PROP.(AmMin, Vol 86, p 1534)

See Also:

Links to other databases for Fluoro-magnesio-arfvedsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Fluoro-magnesio-arfvedsonite

NaNa2(Mg,Fe++)4Fe+++[Si8O22](F,OH)2
Dana No: 66.01.03c.09a Strunz No: 09.DE.25
Locality:

Notes: