Ferriwhittakerite Mineral Data

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General Ferriwhittakerite Information

Chemical Formula:

Na(NaLi)(Mg2Fe+++2Li)Si8O22(OH)2

Composition:

Molecular Weight = 867.82 gm

Potassium 0.63 % K 0.76 % K₂O

Sodium 5.09 % Na 6.86 % Na₂O

Lithium 1.08 % Li 2.32 % Li₂O

Calcium 0.51 % Ca 0.71 % CaO

Magnesium 4.12 % Mg 6.83 % MgO

Titanium 0.66 % Ti 1.10 % TiO₂

Manganese 0.76 % Mn 0.98 % MnO

Aluminum 0.31 % Al 0.59 % Al₂O₃

Zinc 3.01 % Zn 3.75 % ZnO

Iron 13.26 % Fe 4.80 % FeO / 13.62 % Fe₂O₃

Silicon 25.89 % Si 55.39 % SiO₂

Hydrogen 0.15 % H 1.35 % H₂O

Oxygen 42.96 % O

Fluorine 1.58 % F 1.58 % F

- % F -0.66 % -O=F₂

______ ______

100.00 % 99.97 % = TOTAL OXIDE

Empirical Formula:

Na_0.64K_0.14Li_0.62Na_1.28Ca_0.11Fe²⁺_0.58Mg_1.47Mn²⁺_0.12Zn_0.4Fe³⁺_1.48Al_0.1Ti_0.12Li_0.73 Si₈O₂₂(OH)_1.3F_0.72

Environment:

In episyenitic bodies. Amphibole group; structure determined

IMA Status:

Proposed IMA 2002 (Dana # Added)

Locality:

East sector of the Pedriza Massif, Sierra de Guadarrama, Spanish Central System, Spain. Link to MinDat.org Location Data.

Name Origin:

Named for Eric J.W. Whittaker (1921-), of Oxford University, who did pioneering work in amphibole crystal-chemistry.

Synonym:

IMA2001-069

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Ferriwhittakerite Crystallography

Axial Ratios:

a:b:c =0.544:1:0.2967

Cell Dimensions:

a = 9.712, b = 17.851, c = 5.297, Z = 2; beta = 103.63° V = 892.47 Den(Calc)= 3.23

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): 2.701(1)(151), 8.344(0.98)(110), 3.392(0.74)(131),3.098(0.72)(310), 2.524(0.67)(202), 4.463(0.44)(040), 2.576(0.36)(061), 2.157(0.35)(261),

Crystal Structure:

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Oberti R , Camara F , Caballero J M , American Mineralogist , 89 (2004) p.888-893, Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new, Group 5 for monoclinic amphiboles

Physical Properties of Ferriwhittakerite

Cleavage:

{110} Perfect, {110} Perfect

Color:

Bluish black.

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

gray

Optical Properties of Ferriwhittakerite

Optical Data:

NCalc= 1.72 - from Gladstone-Dale relationship (KC = 0.2227) where Ncalc=Dcalc*KC+1

Calculated Properties of Ferriwhittakerite

Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Ferriwhittakerite =3.23 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ferriwhittakerite}= 7.02 barns/electron
U=PE_{Ferriwhittakerite} x r_electron= 22.28 barns/cc.

Radioactivity:

GRapi = 8.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferriwhittakerite per GRapi unit = 11.19 (%)

Estimated Radioactivity from Ferriwhittakerite - barely detectable

Ferriwhittakerite Classification

Dana Class:

66.01.03d.02 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.03d)Group 5, the Na-Ca-Mg-Fe-Mn-Li amphiboles, where Li(b) = 0.50 apfu

66.01.03d.01 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m

66.01.03d.02 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

Strunz Class:

09.DE.15 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.15 Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m

09.DE.15 Ferrochloropargasite! NaCa2(Fe4Al)Si6Al2O22Cl2 C 2/m 2/m

09.DE.15 Potassic-chlorohastingsite! (K,Na)Ca2(Fe,Mg)4Fe[Si6Al2O22](Cl,OH)2 C 2/m 2/m

09.DE.15 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

09.DE.15 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m

09.DE.15 Potassic-chloropargasite! (K,Na)Ca2(Mg,Fe2)4Al(Si6Al2O22)(Cl,OH)2 C 2/m 2/m

Other Ferriwhittakerite Information

References:

NAME( CanMin, 42:1245) PHYS. PROP.(CanMin, 42:1245) OPTIC PROP.(CanMin, 42:1245)

See Also:

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

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Ferriwhittakerite

Na(NaLi)(Mg2Fe+++2Li)Si8O22(OH)2
Dana No: 66.01.03d.02 Strunz No: 09.DE.15
Locality:

Notes: