Potassicarfvedsonite Mineral Data

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General Potassicarfvedsonite Information

Chemical Formula:

KNa2Fe++4Fe+++Si8O22(OH)2

Composition:

Molecular Weight = 962.95 gm

Potassium 2.72 % K 3.28 % K₂O

Sodium 5.18 % Na 6.98 % Na₂O

Lithium 0.21 % Li 0.45 % Li₂O

Calcium 0.21 % Ca 0.29 % CaO

Magnesium 0.03 % Mg 0.04 % MgO

Titanium 0.25 % Ti 0.41 % TiO₂

Manganese 1.08 % Mn 1.40 % MnO

Aluminum 0.31 % Al 0.58 % Al₂O₃

Zinc 0.14 % Zn 0.17 % ZnO

Iron 27.14 % Fe 24.55 % FeO / 11.53 % Fe₂O₃

Silicon 22.63 % Si 48.42 % SiO₂

Hydrogen 0.19 % H 1.69 % H₂O

Oxygen 39.56 % O

Fluorine 0.36 % F 0.36 % F

- % F -0.15 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.67Na_0.22Na_1.95Ca_0.05Fe²⁺_3.29Fe³⁺_1.26Li_0.29Mn²⁺_0.19Ti_0.05Zn_0.02Mg_0.01Si_7.76 Fe³⁺_0.13Al_0.11O₂₂OH_1.81F_0.18

Environment:

Alkaline pegmatites in agpaitic complexe Ilímaussaq (Greenland). Amphibole group

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Ilímaussaq complex, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named as the K-dominant analogue of arfvedsonite.

Synonym:

IMA2003-043

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Potassicarfvedsonite Crystallography

Axial Ratios:

a:b:c =0.554:1:0.2946

Cell Dimensions:

a = 10.002, b = 18.054, c = 5.319, Z = 2; beta = 103.9° V = 932.36 Den(Calc)= 3.43

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): 8.53(1)(110), 3.184(0.4)(310), 9.02(0.28)(020),3.303(0.23)(240), 2.847(0.17)(330), 3.419(0.12)(131), 2.725(0.1)(151),

Crystal Structure:

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Pekov I V , Chukanov N V , Lebedeva Y S , Pushcharovsky D Y , Ferraris G , Gula A , Zadov A E , Novakova A A , Petersen O V , Neues Jahrbuch fur Mineralogie, Monatshefte , 2004 (2004) p.555-574, Potassicarfvedsonite, KNa2Fe2+4Fe3+Si8O22(OH)2,a K-dominant amphibole of the, arfvedsonite series from agpaitic pegmatites - Mineral data, structure, refinement and disorder in the A site, Locality: Ilimaussaq, Greenland

Physical Properties of Potassicarfvedsonite

Cleavage:

{110} Perfect, {110} Perfect

Color:

Bluish gray, Dark blue green.

Diaphaneity:

Translucent to transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Potassicarfvedsonite

Gladstone-Dale:

CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2016,KC= 0.2167
Ncalc = 1.74

Optical Data:

Biaxial (-), a=1.683, b=1.692, g=1.699, bire=0.0160, 2V(Calc)=82, 2V(Meas)=>60. Dispersion strong, r > v.

Calculated Properties of Potassicarfvedsonite

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Potassicarfvedsonite =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Potassicarfvedsonite}= 9.73 barns/electron
U=PE_{Potassicarfvedsonite} x r_electron= 32.63 barns/cc.

Radioactivity:

GRapi = 38.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Potassicarfvedsonite per GRapi unit = 2.61 (%)

Estimated Radioactivity from Potassicarfvedsonite - barely detectable

Potassicarfvedsonite Classification

Dana Class:

66.01.03c.09b (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 Potassicarfvedsonite Information

References:

NAME( AmMin, v90, p1437) PHYS. PROP.(AmMin, v90, p1437) OPTIC PROP.(AmMin, v90, p1437)

See Also:

Links to other databases for Potassicarfvedsonite :
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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Print or Cut-and-Paste your Potassicarfvedsonite Specimen Label here :

Potassicarfvedsonite

KNa2Fe++4Fe+++Si8O22(OH)2
Dana No: 66.01.03c.09b Strunz No: 09.DE.25
Locality:

Notes: